Luan Van Tham Khao -HSDPA

8/4/2019 Luan Van Tham Khao -HSDPA

1/58

Kha Lun Tt Nghip Thng Tin Di ng

LI CM N

Trc ht, em xin chn thnh cm n Ths. Trn Ngc Hng, s ch bo tn

tnh cng nhng ti liu qu bu ca Thy gip em hon thnh lun vn ny.

Em cng xin c gi li cm n n cc Thy, C gio trong trng i hc

Cng Ngh - H QG H Ni to mi iu kin hc tp v nghin c cho em

trong sut bn nm hc va qua. Xin cm n cc bn hc v nhng ngi thn

lun gip , ng vin v chia s nhng lc ti kh khn trong thi gian thc

hin lun vn ny.

Do thi gian hn hp v cng chu nhiu yu t tc ng nn kho lun s

khng trnh khi sai st. Em rt mong s nhn c nhng kin ng gp

xy dng ca Thy, C v cc bn c th tip tc pht trin hng nghin

cu ca mnh.

H Cng Ngh - HQGHN Nguyn Th Thu Hng -K491


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LI M U

Ngy nay, thng tin di ng tr thnh mt ngnh cng nghip vin thng

pht trin nhanh nht v phc v con ngi hu hiu nht. p ng nhu cu v

cht lng v dch v ngy cng nng cao, thng tin di ng cng khng ngng

c ci tin.

Tin thn ca 3G l h thng in thoi 2G, nh GSM, CDMA, PDC, PHS...

GSM sau c nng cp ln thnh GPRS, hay cn gi l th h 2,5G. GPRS h tr

tc 140,8 Kb/giy d t l thng gp ch l 56 Kb/giy. E-GPRS, hay EDGE, l

mt bc tin ng k t GPRS vi kh nng truyn d liu 180 Kb/giy v c xp

vo h thng 2,75G.Nm 2006, mng UMTS ti Nht nng cp ln HSDPA (High Speed Downlink

Packet Access - Truy cp gi d ng xung tc cao) - l mt tnh nng mi c

cp trong cc phin bn R5 ca 3GPP cho h thng truy nhp v tuyn WCDMA/UTRA-

FDD v c xem nh l mt trong nhng cng ngh tin tin cho h thng thng tin di

ng 3.5G. HSDPA bao gm mt tp cc tnh nng mi kt hp cht ch vi nhau ci

thin dung lng mng v tng tc d liu nh i vi dung lng gi ng xung.

Nhng ci tin v mt k thut cho php cc nh khai thc c th a ra nhiu dch v tc

bit cao, ci thin QoS ca cc dch v hin c, v t chi ph thp nht. Kh nng h

tr tc d liu v tnh di ng ca WCDMA/HSDPA l cha tng c trong cc phin

bn trc y ca 3GPP.

Trong khun kh kho lun ny, tc gi i vo nghin cu cu trc HSDPA v

ng dng vo mng di ng th h th 3G. ng thi a ra phng php lun cho

cc nh khai thc mng v tnh hiu qu ca cng ngh ny.

MC LC



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DANH MC CC K T VIT TT ....................................................................5

DANH MC CC HNH V.....................................................................................7

DANH MC CC BNG .........................................................................................8

CHNG 1: TNG QUAN V H THNG THNG TIN DI NG................9

1.1 M u...........................................................................................................9

1.2 Cc tiu chun xy dng mng 3G............................................................13

1.3 Cc tham s ca mng chnh ca mng WCDMA...................................14

1.4 Cc knh c bn ca WCDMA..................................................................16

1.4.1 Knh logic.........................................................................................17

1.4.1.1 Knh iu khin.....................................................................18

1.4.1.2 Knh lu lng......................................................................18

1.4.2 Knh truyn ti..................................................................................19

1.4.2.1 Knh truyn ti ring..............................................................19

1.4.2.2 Knh truyn ti chung............................................................19

1.4.3 Knh vt l........................................................................................20

1.4.3.1 Knh ng ln......................................................................20

1.4.3.2 Knh ng xung.................................................................21

1.5 Cc bc ci tin ca cng ngh WCDMA...............................................24CHNG 2. GII THIU V CNG NGH HSDPA........................................27

2.1 Tng quan v HSDPA.................................................................................27

2.2 Nhng ci tin quan trng ca HSDPA so vi WCDMA........................29

2.3 Nguyn l hot ng ca HSDPA..............................................................31

2.4 Cu trc HSDPA.........................................................................................33



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2.4.1 M hnh giao thc HSDPA................................................................33

2.4.2 Cu trc knh.....................................................................................35

2.4.2.1 Knh HS-PDSCH...................................................................35

2.4.2.2 Knh HS-DPCCH..................................................................39

2.5 K thut s dng trong HSDPA...............................................................41

2.5.1 iu ch v m ho thch ng...........................................................41

2.5.2 K thut H-ARQ................................................................................44

CHNG 3. NG DNG TRN HSDPA.............................................................47

3.1 VoIP song cng ton phn v thc y tr chuyn..................................47

3.2 Tr chuyn vi thi gian thc....................................................................48

3.3 Lung TV di ng.......................................................................................48

3.4 Email...........................................................................................................49

KT LUN................................................................................................................52

PH LC...................................................................................................................53

TI LIU THAM KHO........................................................................................58



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DANH MC CC K T VIT TT

1G : First Generation

2G : Second Generation

3G : Third Generation

3GPP : 3rd Generation Partnership Project

16QAM : 16 Quadrature Amplitude Modulation

64QAM : 64 Quadrature Amplitude Modulation

AMC : Adaptive Modulation and Coding

ARQ : Automatic Repeat request

BCCH : BroadCast Control CHannel (logic channel)

BCH : BroadCast CHannel (transport channel)

BER : Bit Error Rate

CCTRCH : Coded Composite Transport Channel

DCCH : Dedicated Control CHannel (logical channel)

DPCCH : Dedicated Physical Control CHannel

DPCH : Dedicated Physical Channel

DPDCH : Dedicated Physical Data Channel

DTCH : Dedicated Traffic CHannel

EDGE : Enhanced Data Rates for GSM Evolution

FDD : Frequency Division Multiple Access

GSM : Global System for Mobile Communications

H-ARQ : Hybrid Automatic Repeat request

HS-DPCCH : Uplink High-Speed Dedicated Physical Control CHannel



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HS-DSCH : High-Speed Downlink Shared Channel

HS-PDSCH : High-Speed Physical Downlink Shared Channel

HS-SCCH : High-speed Shared Control Channel

HSDPA : High-speed Downlink Packet Access

ITU : Internation Telecommunication Union

MAC : Medium Access Control

MAC-hs : Hight-speed MAC

Node B : Base Station

SAW : Stop And Wait

TTI : Transmission Time Interval

UMTS : Universal Mobile Telecommunication System

WCDMA : Wideband CDMA



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DANH MC CC HNH V

Hnh 1 :Cc bc pht trin mng thng tin di ng

Hnh 2: Cu trc knh ca WCDMA

Hnh 3: Cu trc knh logic

Hnh 4: nh x gia knh logic v knh giao vn

Hnh 5: Tc truyn WCDMA ng ln

Hnh 6: Cu trc ca knh dnh ringHnh 7: Cu trc knh CCPCH

Hnh 8: Cu trc ca knh ng b SCH

Hnh 9: Cht lng khe thi gian truy cp ca knh RACH

Hnh 10: Biu ct so snh thi gian download ca cc cng ngh

Hnh 11:Cc tnh nng c bn ca HSDPA khi so snh vi WCDMA

Hnh 12 - Nguyn l hot ng c bn ca HSDPA

Hnh 13: Kin trc giao din v tuyn ca knh truyn ti HS-DSCH

Hnh 14: Cu trc lp MAC hs

Hnh 15: Giao din v tuyn ca HSDPAHnh 16: Thi gian v b m c chia s trong HS-DSCH

Hnh 17: Trng thi knh ca cc user

Hnh 18.1 : H thng trong trng hp 1 knh HS-SCCH v phn chia a thi gian

Hnh 18.2: H thng trong trng hp nhiu knh HS-SCCH v phn chia a thi gian

Hnh 19: Cu trc knh HS-DPCCH

Hnh 20: Biu din m ho iu ch ca HSDPA v tc bit ti a kh dng

vi mi m theo dBHnh 21: Hot ng ca giao thc SAW 4 knh

Hnh 22: Qu trnh truyn li khi d liu IR

Hnh 23: c lng tiu th cng sut ca in thoi di ng

Hnh 24: Truy cp email t mobile s dng pin 1000-mAh



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DANH MC CC BNG

Bng 1: Bng so snh cc cng ngh di ng v tc truyn d liu

Bng 2: Cc thng s chnh ca WCDMA

Bng 3: Tc d liu nh ca HSDPA trong mt s trng hp

Bng 4: Lc m ho iu ch ca HSDPA v tc bit ti a kh dng vi mi m



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Chng 1: TNG QUAN V H THNG THNG TIN DI NG

TH H 3G

1.1 M u

Th h in thoi di ng u tin (1G) ra i trn th trng vo nhng nm

70/80. y l nhng in thoi anolog s dng k thut iu ch radio gn ging nh

k thut dng trong radio FM. Trong th h in thoi ny, cc cuc thoi khng c

bo mt. Th h 1G ny cn thng c nhc n vi "Analog Mobile Phone System

(AMPS)". Mc thi gian nh du s ra i ca 2G, in thoi k thut s (digital) l

u nhng nm 90. Chun k thut s u tin l D-AMPS s dng TDMA (Time

division Mutiple Access). Tip theo sau l in thoi 2G da trn cng ngh CDMA ra

i. Sau Chu u chun ha GSM da trn TDMA. Ci tn GSM ban u xut

pht t "Groupe Speciale Mobile" (ting Php), mt nhm c thnh lp bi CEPT,

mt t chc chun ha ca Chu u, vo nm 1982. Nhm ny c nhim v l chun

ha k thut truyn thng di ng bng tng 900MHz. Sau ,GSM c chuyn

thnh Global System for Mobile Communication vo nm 1991 nh l mt tn tt ca

cng ngh ni trn.

Nm 2001, tng thng lng truyn phc v nhu cu truyn thng tin

(khng phi thoi) trn mng di ng, GPRS ra i. GPRS i khi c xem nh l

2.5G. Tc truyn data rate ca GSM ch =9.6Kbps. GPRS ci tin tc truyn

tng ln gp 3 ln so vii GSM, tc l 20-30Kbps. GPRS cho php pht trin dch v

WAP v internet (email) tc thp.

Tip theo sau, 2003, EDGE ra i vi kh nng cung ng tc ln c

250 Kbps (trn l thuyt). EDGE cn c bit n nh l 2.75G (trn ng tin

ti 3G)

Cm t in thoi di ng 3G ngy nay tr nn quen thuc vi ngi

dng di ng. 3G l vit tt ca third-generation technology l chun v cng

ngh truyn thng th h th ba, cho php truyn ngoi d liu chun l m thoi

cn c th truyn d liu phi thoi (ti d liu, gi email, tin nhn nhanh, hnh



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nh, nhc, internet...). Cng ngh 3G va cho php trin khai nhng dch v cao

cp va lm tng dung lng ca mng in thoi nh vo vic s dng hiu qu

hiu sut ph.

Hnh 1 :Cc bc pht trin mng thng tin di ng

Trong s cc dch v ca 3G, in thoi video hoc kh nng truy nhp internet

thng c xem l mt v d tiu biu v dch v cao cp m cc nh cung cp dch

v mun cung cp cho khch hng. Tuy nhin tn s v tuyn ni chung l mt ti

nguyn t , gi tn s cho cng ngh 3G rt t ti nhiu nc, ni m cc cuc

bn u gi tn s mang li hng t euro cho chnh ph. Bi v chi ph cho bn quynv cc tn s phi trang tri trong nhiu nm trc khi cc thu nhp t mng 3G em

li, nn mt khi lng u t khng l l cn thit xy dng mng 3G. Nhiu nh

cung cp dch v vin thng ri vo kh khn v ti chnh v iu ny lm chm

tr vic trin khai mng 3G ti nhiu nc ngoi tr Nht Bn v Hn Quc, ni yu

cu v bn quyn tn s c b qua do pht trin h tng c s IT quc gia c t

u tin cao.

Nc u tin a 3G vo khai thc thng mi mt cch rng ri l Nht Bn.

Nm 2005, khong 40% cc thu bao ti Nht Bn l thu bao 3G, mng 2G ang dn

bin mt ti Nht Bn.

Vi 3G, chng ta s c mt s tn gi lin quan nh: cng ngh (nn tng)

3G, mng 3G, chun 3G. Cng ngh 3G v chun 3G c th coi l mt, trong khi

mng 3G l mng di ng ng dng nhng cng ngh 3G. Trc y, chun 3G

l mt chun n l, duy nht v c p dng rng ri trn ton th gii. Tuy



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nhin, cng v sau ny, 3G cng c phn chia thnh nhiu chun khc khc,

tu thuc vo kh nng nghin cu ca cc nh cung cp dch v. Trong tng

lai khng xa, c th l mt hoc hai ba nm na, mng di ng s tr thnh mt

mng truyn d liu tc cao, p ng nhu cu ngy cng tng ca ngidng. c th thc hin c cc kh nng ny, mng di ng phi da vo

nhng nn tng cng ngh mi 3G, 3,5G v 4G hay cn gi l cc nn tng

cng ngh di ng tng lai.



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Bng 1: Bng so snh cc cng ngh di ng v tc truyn d liu

Cng ngh Tc Tnh nng

1G AMPS Khng c Analog (ch c chc nng thoi)

2G

- GSM

- CDMA

- iDen

Nh hn

20Kbps

- Thoi

- SMS

- Gi hi ngh

- Caller ID

- Push to - talk

2.5G

- GPRS

- 1xRTT

- EDGE

T

30Kbps90Kbps

- MSM

- nh

- Trnh duyt Web

- Audio/Video clip

- Game

- Ti cc ng dng v nhc

chung

3G

- UMTS

- 1xEV-DO

T

144Kbps2Mbps

- Video cht lng cao

- Nhc streaming

- Game 3D

- Lt web nhanh

3.5G - HSDPA

- 1xEV-DV T

384Kbps14.4Mbp

s

- Video theo yu cu (VOD)

- Video hi hp

1.2 Cc tiu chun xy dng mng 3G



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3G bao gm 3 chun chnh l :

W-CDMA

CDMA2000

TDSCDMA.

Trong , chun W-CDMA c hai chun con thnh phn l :

UMTS

FOMA.

W-CDMA (Wideband Code Division Multiple Access): l chun lin lc di ng

3G song hnh vi cng vi chun GSM. W-CDMA l cng ngh nn tng cho cc

cng ngh 3G khc nh UMTS v FOMA.

W-CDMA c tp on ETSI NTT DoCoMo (Nht Bn) pht trin ring cho

mng 3G FOMA. Sau , NTT Docomo trnh c t ny ln Hip hi truyn thng

quc t (ITU) v xin cng nhn di danh ngha mt thnh vin ca chun 3G quc t

c tn IMT-2000. ITU chp nhn W-CDMA l thnh vin ca IMT-2000 v sau

chn W-CDMA l giao din nn tng cho UMTS.

UMTS: UMTS (Universal Mobile Telephone System) da trn cng ngh W-

CDMA, l gii php tng qut cho cc nc s dng cng ngh di ng GSM. UMTS

do t chc 3GPP qun l. 3GPP cng ng thi chu trch nhim v cc chun mng

di ng nh GSM, GPRS v EDGE. S pht trin lin tc cc tiu chun k thut trn

c th hin bng 4 m thc v tiu chun UMTS ca t chc 3GPP l: R99, R4, R5

v R6, to thnh mt b tiu chun s nhng trong n li gm nhng h tiu chun

tng i c lp. WCDMA l mt tiu chun v giao din khng gian u tin, sm

nht v hon thin nht trong cc h tiu chun v c cc nh khai thc v sn

xut thit b vin thng c 3 chu lc: u, , M s dng rng ri. UMTS cng l

dng cng ngh chim th phn ln nht trn th trng thng tin di ng ngy nay

(chim ti 85,4% theo GSA 8-2007).



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Hin nay, mng UMTS c th nng cp ln High Speed Downlink Packet Access

(HSDPA) - cn c gi vi tn 3,5G. HSDPA cho php y nhanh tc ti ng

xung vi tc ln ti 10 Mbps.

1.3 Cc tham s chnh ca WCDMA

- WCDMA l h thng s dng chui tri ph trc tip. Ngha l lung thng tin

c tri trn mt bng thng rng bng vic nhn lung d liu ny vi mt chui

tri ph gi ngu nhin PN. c th h tr vic truyn d liu tc cao, h s tri

ph (SF) thay i v kt ni da trn nhiu m tri ph c h tr trong WCDMA

- Tc chip s dng trong WCDMA c tc 3.84 Mps tng ng vi bng

tn truyn dn WCDMA l 5 MHz (i vi CDMA2000 bng tn truyn dn c th l3x1.25 Mhz hoc 3.75 MHz). Bng thng truyn dn ln ca WCDMA ngoi vic

nhm h tr truyn dn tc cao cn mang li mt vi u im khc nh: tng h s

phn tp a ng.

- WCDMA h tr truyn dn tc thay i, hay ni cch khc l khi nim s

dng bng thng theo nhu cu c th c thc hin. Trong mt khung truyn dn th

tc d liu l c nh. Tuy nhin tc d liu gia cc khung truyn dn khcnhau c th ging nhau hoc khc nhau.

- WCDMA c hai ch hot ng l FDD v TDD. i vi FDD th cc

cp tn s sng mang vi rng 5 MHz c s dng cho knh truyn dn hng

ln v hng xung mt cch tng ng. Trong khi ch TDD th ch c mt

sng mang rng 5 MHz c s dng cho c ng ln v ng xung theo kiu

phn chia theo thi gian. TDD c s dng gii bng tn khng chia cp c.

- Cc BTS trong WCDMA (Node B) hot ng ch khng ng b. Do

khng cn cung cp mt ngun ng h ng b cho tt c cc BTS trong mng v d

nh s dng GPS. Ch lm vic khng ng b ny gip cho WCDMA tr nn d

trin khai cu hnh indoor v micro cell

- WCDMA s dng tch sng nht qun trn c hai hng ln v xung s dng

cc k hiu dn ng. Ch tch sng ny c s dng trn ng xung i

vi mng 2G IS-95.



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- Giao din v tuyn ca WCDMA c thit k nh vn hnh c th

la chn s dng cc cng ngh my thu hin i nh: MUD, h thng nten

thch ng nhm tng dung lng ca mng cng nh vng ph sng ca cc

trm thu pht.

- WCDMA c thit k c th trin khai bn cnh h thng GSM th

h 2. Ngha l WCDMA c th h tr chuyn giao gia hai h thng WCDMA

v GSM nhm m bo c mt s dch chuyn mm do khi trin khai mng 3G-

WCDMA.

Bng 2: Cc thng s chnh ca WCDMA

Bng tn knh 1,25Mhz; 5Mhz; 10Mhz; 20MhzCu trc knh hng xung Tri ph trc tip

Tc chip (1,024)a/4,096/8,192/16,384

Lp 0,22

di khung 10 ms/ 20 ms

iu ch tri ph QPSK cn bng (hng xung)

QPSK kp (hng ln)

Mch truyn phc hp

iu ch d liu QPSK (hng xung)

BPSK (hng ln)

Pht hin kt ni Knh pilot ghp thi gian (hng ln v

hng xung)

Khng c knh pilot chung hng xung.

Ghp knh hng ln Knh iu khin, knh pilot ghp thi gian.

Ghp knh I&Q cho knh d liu v knh

iu khin.

a tc Tri ph bin i v a m

H s tri ph 4 256

iu khin cng sut Vng h v vng khp kn (tc 1,6KHz)

Tri ph (hng ln) M trc giao di phn bit knh, m



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Gold 218

Tri ph (hng xung) M trc giao di phn bit knh, m

Gold 241

Chuyn giao Chuyn giao mm (Soft handoff)Chuyn giao khc tn s

1.4 Cc knh c bn ca W-CDMA

Hnh 2: Cu trc knh ca WCDMA

T hnh 2 cho ta ci nhn tng quan v cc knh c s dng trong WCDMA

gm 3 knh c bn:

- Knh logic

- Knh truyn ti

- Knh vt l

Knh logic: miu t loi thng tin s c truyn i. Mc d gi l "knh" nhng

n khng phi l knh theo ging ngha nh knh vt l, knh vn ti. Knh logic c

th hiu l nhng cng vic m mng v thit b cn phi thc hin ti nhng thi

im khc nhau. Cc knh logic ny cng c th xem nh l dch v m lp MAC

cung cp cho lp RLC trn n.

http://tudiencongnghe.com/Special:Search/MAChttp://tudiencongnghe.com/Special:Search/MAC


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Knh vn ti: qui nh bng cch no v vi c trng g thng tin s c truyn

i. y l dch v m lp vt l cung cp cho lpMAC trn n.

Knh vt l: chnh l knh hin hu truyn ti thng tin i.

Vic phn ra cc loi knh khc nhau mnh ngh l ging vic phn lp trong

mng, gip cho d qun l v iu khin. C ng vi mi loi thng tin km theo

nhng c trng ca n, mng s t ng truy cp vo cc knh tng ng gi

thng tin i mt cch hiu qu nht.

1.4.1 Knh logic

Hnh 3: Cu trc knh logic

Knh logic nh ngha loi s liu c truyn i, bao gm 2 loi knh: Knh

iu khin v knh lu lng.

1.4.1.1 Knh iu khin

Knh iu khin chung



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- Knh iu khin qung b (BCCH): hot ng tuyn xung, a thng tin

nhn bit t bo, mng v tnh trng hin ti ca t bo (cu trc iu khin, cc lu

lng cn ri, ang s dng hoc nghn)

- Knh nhn tin PCH: cung cp tin nhn t BS n MS, PCH pht IMSI ca thu

bao v yu cu pht li trn RACH- knh iu khin ngu nhin. Ngoi ra PCH cng

c th c dng cung cp cc bn tin qung b dng ASCII

- Knh truy cp hng xung DACH chuyn bn tin t BS n MS trong 1 cell.

Hai knh dnh ring:

- Knh iu khin dnh ring DCCH gm knh iu khin dnh ring ng mt

mnh SDCCH v knh iu khin lin kt ACCH.

1.4.1.2 Knh lu lng

Dng truyn cc thng tin ca in thoi hoc s liu bao gm 2 knh:

- Knh lu lng dng ring (DTCH) : chuyn d liu theo m hnh kt

ni im - im v 2 hng n 1 thu bao v c s dng truyn thng tin

ngi dng.

- Knh lu lng dng chung (CTCH): chuyn d liu theo m hnh kt ni

im - im trn knh ng xung, s dng truyn thng tin c nhn n tt c

cc thu bao trong cng nhm.

1.4.2 Knh truyn ti

Knh truyn ti mang cc thng s, c tnh cn thit truyn ti cc thng tin

d liu qua mng. Cc knh truyn ti c hnh thnh nh vic sp xp cc knh

logic. C 2 loi knh truyn ti :

- Knh truyn ti ring DCH: mang thng tin iu khin cho ring mt MS vi

mang DCH-UL, DCH-DL.

- Knh truyn ti chung CCH : dng chung cho tt c cc MS

Mi knh truyn ti cha mt m ch th nh dng truyn ti TFI (Transport

Format Indicator). TFI c s dng phi hp lm vic gia lp MAC v lp vt



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l. Lp vt l s ghp a hp nhiu knh truyn ti vi nhau to thnh mt knh

truyn ti m ho hn hp CCTRCH (Transport Format Combination Indicator) v gi

km trong knh CCTRCH. T hp m TFCI c truyn i trong knh iu khin vt

l thng bo vi u thu knh truyn ti no ang c nhn. Tip , TFCI sc gii m v to ra cc TFI tng ng gi ln lp trn.

1.4.2.1Knh truyn ti ring

Vi knh truyn ti ring ch c mt knh duy nht l knh DCH. Knh ny c

th hot ng tuyn ln hoc tuyn xung.

1.4.2.2 Knh truyn ti chung

Knh truyn ti chung bao gm 6 knh: BCH, FACH, PCH, RACH, CPCH v

DSCH.

- Knh BCH - knh qung b, l knh truyn ti ng xung, s dng

qung b nhng thng tin trong h thng hay trong 1 t bo.

- Knh FACH- Knh truy cp gi i, cng l knh truyn ti ng xung. C

th hot ng trong ton b hay mt phn t bo. Vic gi knh ny c thc hin

sau khi BS nhn c bn tin truy nhp ngu nhin.

- Knh PCH Knh tm gi, l knh mang d liu cn thit cho cc th tc tin

nhn, l khi h thng mun kt ni lien lc vi thu bao.

- Knh RACH Knh truy cp ngu nhin, l knh mang thng tin iu khin

t thu bao, nh yu cu thit lp mt kt ni.

- Knh CPCH Knh d liu gi chung, l knh m rng ca knh RACH,

c s dng truyn d liu user dng gi trn hng ln. i cp vi knh ny,

hng xung d liu gi c truyn trn knh FACH.

- Knh DSCH Knh chia s ng xung, l knh mang cc thng tin d liu

hoc thng tin iu khin ca ngi dng.



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Hnh 4: nh x gia knh logic v knh giao vn

1.4.3 Knh vt l

Cc knh truyn ti c x l tip theo bng cch ghp vo cc knh vt l.

Knh vt l c qun l v x l ti lp vt l. Vic x l y thc hin nhng k

thut bin i cn thit nhm tng thch c tnh truyn dn v tuyn v m bo

cht lng tn hiu cao nht.

1.4.3.1 Knh ng ln

Hai knh dnh ring:

- DPDCH (truyn d liu) :

- DPCCH (truyn bo hiu)

- Mt knh truy cp chung RACH.

Hu ht cc trng hp mi cuc gi ch c cp mt knh DPDCH cho cc

dch v chia s thi gian. Cng c th cp nhiu knh, chng hn c h s tri phln khi truyn d liu tc cao.



21/58


Hnh 5: Tc truyn WCDMA ng ln

- Knh DPDCH dng :

+ Truyn pilot cho thu tng can.

+ Truyn bit iu khin cng sut.

+ Truyn tin tc v tc .

1.4.3.2 Knh ng xung

- Knh vt l iu khin chung (s cp v th cp) CCPCH mang: BCCH,

PCH, PACH.

- Knh SCH cung cp nh thi v MS o lng SCH phc v chuyn giao.

- Knh dnh ring (DPDCH v DPCCH) ghp knh theo thi gian. K hiu pilotc ghp knh trn BCCH(theo thi gian) phc v thu tng quan. V cc k hiu

pilot l dnh ring cho mi kt ni nn n c dng nh gi s hot ng thch

ng ca anten, h tr iu khin cng sut nhanh hng xung. CCPCH s cp

mang BCCH v knh pilot chung c ghp knh theo thi gian. CCPCH c m nh

nhau trong tt c cc cell.



22/58


Hnh 6: Cu trc ca knh dnh ring

- CCPCH th cp ghp knh theo thi gian PCH vi PACH trong cu trc siu

khung. Tc bn tin CCPCH l kh bin t cell ny sang cell khc.

Hnh 7: Cu trc knh CCPCH

- Knh SCH- knh ng b, s dng cho th tc ng b mng. Dng khi thc

hin th tc nh v v ng b mng.



23/58


Hnh 8: Cu trc ca knh ng b SCH

- SCH s cp khng iu ch cung cp nh thi xc nh SCH th cp m SCH

th cp c iu ch cung cp tin tc xc m PN ca BS. SCH s cp s dng m 256

bits khng iu ch, pht mi ln 1 khe. SCH th cp m 256 bits c iu ch, pht

song song vi SCH s cp. SCH th cp c iu ch vi chui nh phn 16 bits (c

lp cho mi khung). Chui iu ch ging nhau vi tt c BS c t tng quan tt.

- Knh PRACH Knh vt l truy xut ngu nhin, c s dng hng ln

mang thng tin truy xut mng. Trong mt vi trng hp dng pht thng tin s liu

gi. Hnh 9 cho ta ci nhn s b v cht lng khe thi gian truy cp ca knh RACH.



24/58


Hnh 9: Cht lng khe thi gian truy cp ca knh RACH

1.5 Cc bc ci tin ca cng ngh WCDMA

Cc dch v di ng 3G gip ngi tiu dng v cc nh chuyn nghip tri

nghim cht lng thoi u hng, cng vi rt nhiu dch v d liu hp dn nh:

Kt ni Internet di ng

Email di ng

Cc dch v a phng tin, nh nh k thut s v phim c thu v chia s

qua cc thit b cm tay di ng.

Download cc ng dng di ng

Video-theo-yu cu

Chi game online Cc dch v khn cp v nh v nng cao

Cc dch v nhn tin bm--ni v bm--xem video c thi gian ch thp.

H thng thng tin di ng 3G s dng cng ngh truy nhp v tuyn WCDMA

v CDMA2000 ang c trin khai rng khp trn ton th gii. Tnh n thi im

thng 12 nm 2005 c hn 160 h thng 3G c a vo s dng trn phm vi 75

quc gia vi tng s thu bao ln n 230 triu. Tuy phin bn u tin R99, dung



25/58


lng v tc truyn dn d liu c ci thin ng k. Lung tc s liu c th t

n tc 2 Mbps. Nhng khi cc dch v s liu c a vo trin khai trn cc

mng thng mi th dung lng, tc vn l nhng i hi cn phi c gii

quyt. Do , bc ci tin u tin i vi WCDMA c nh du bi s ra i caknh truyn ti mi HS-DSCH R5 c hon thnh vo u nm 2002. Nhng ci

tin trong R5 ny thng c nhc n vi mt tn gi "HSDPA- Knh truy nhp gi

ng xung tc cao". S ra i ca HSDPA nhm h tr mnh m cc dch v s

liu yu cu tc c truyn dn ln nh cc dch v tng tc, dch v nn, dch v

streaming. Truy nhp d liu knh ng xung tc cao HSDPA c kh nng cung

cp dung lng cao hn 50% so vi knh DCH/DSCH trong R99 vi trng hp

Marcrocell v 100% i vi Microcell, tc truyn dn ti a c th ln n 14

Mbps. Qua thc t trin khai cc mng di ng 3G cho thy c rt nhiu dch v s

liu ph bin yu cu tc truyn dn trn hai hng t MS n Node B v ngc li

c tc tng ng nhau nh cc dch v real-time gaming v cc dch v trn nn

TCP/IP. Trong khi , R5 mi ch a ra gii php h tr mnh m vic truyn dn

bt i xng vi tc truyn dn trn knh ng xung cao hn rt nhiu so vi

knh ng ln. Nhc im ny ca R5 c khc phc trong R6 c hon thnh

vo u nm 2005 vi tn gi ci tin knh ng ln v l bc ci tin th 2 i vi

chun mng truy nhp v tuyn WCDMA. Nhng ci tin trong R6 nng tc

truyn dn trn knh ng ln t n tc 5.76 Mbps dung lng knh tng ln

gp 2 ln so vi knh truyn ti ng ln trong R99. Ba mc tiu chnh ca hai bc

ci tin trong R5 v R6 l:

- Nng cao tc truyn dn trn c hai hng.

- Tng dung lng ca mng trn mt n v ti nguyn v tuyn nh trc.

- Gim tr truyn dn cho c hai hng.

Mc tiu th 3 c thc hin thng qua vic a mt s chc nng lp MAC

n gn hn vi giao din v tuyn. V d nh chuyn chc nng truyn dn li t

RNC n Node B. Hn th na gim thi gian ca khung truyn dn cng l mt gii

php gim tr. C th khung thi gian truyn dn TTI ca knh DCH trong R99 l



26/58


t 10-80 ms trong khi khong thi gian ny c gim xung cn 2 ms trong HS-

DSCH ca R5. Hoc nh vi knh ng ln ci tin trong R6, ngoi h tr khung

truyn dn 10 ms phin bn trc, khung truyn dn 2 ms cng c s dng trong

phin bn ny nhm t c mc tiu th 3 nu trn.

Mc tiu 1 v 2 c thc hin thng qua k thut thch ng knh bao gm thay

i t l m ca m sa li knh, chn chm tn hiu iu ch ph hp vi iu kin

knh truyn, iu khin thu pht theo s thay i ca knh truyn dn. im ng ch

l tng ch ca k thut thch ng knh khng ch mng li li ch cho cc nh vn

hnh mng nh cc phin bn trc m cn mang li li ch cho khch hng s dng

cc my di ng c tnh nng x l tn hiu tt. Li ch ny cn l xc tc cho vic y

nhanh tc tiu th cc sn phm my di ng cm tay cng ngh cao ca cc nh

sn xut.

Ngoi ra, t ng yu cu truyn dn li cng l mt trong ba k thut then cht

c s dng ti lp vt l t c c 3 mc tiu nu trn thng qua vic tn

dng kt thc truyn dn sm, c x l ti node B gn vi giao din v tuyn.



27/58


Chng 2 : GII THIU V CNG NGH HSDPA

2.1 Tng quan v HSDPA

Mc d cng ngh 3G WCDMA hin nay cho php tc d liu gi ln n

2Mbps. Tuy nhin, cc tiu chun thit k h thng WCDMA c mt s hn ch nh:

Khng tn dng cc u th ca d liu gi vn rt ph bin i vi ng trc

hu tuyn

Thit k dch v 2Mbps hin nay l khng hiu qu v cng cha p ng

c nhu cu s dng dch v s liu

Khng th x l tc d liu cao ln n 10Mbps

Do , R5 tip tc c pht trin khc phc nhng hn ch ny. R5 l s

pht trin quan trng ca mng v tuyn 3G k t khi WCDMA c chp nhn l

cng ngh mng v tuyn 3G t nm 1997 vi Cc tnh nng k thut ca cng

ngh HSDPA gm:

Tng ng vi CDMA2000 1xEV (HDR)

iu ch v m ho thch ng

Sng mang tc d liu cao (HDRC) trong bng tn 5MHz

64 QAM h tr tc nh tng ng 7.2 Mbps

M Turbo

Kh nng sa li gn vi gii hn l thuyt

ARQ ghp thch ng

T ng thch ng lin tc theo iu kin knh bng cch ghp chn thm

thng tin khi cn

S dng AMC khi c kt hp vi HARQ nhm ci thin dung lng

ca h thng



28/58


Cc k thut c s dng cho php HSDPA h tr tc 10 Mbps

Trong mt h thng d liu v thoi c tch hp vi ngi s dng

thoi(12.2 Kbps) ti khong 30 Erl/sector v thng lng sector ca d liu vn

khong 1 Mbps

Hnh 10 : Biu ct so snh thi gian download ca cc cng ngh

HSDPA (High-Speed Downlink Packet Access)-truy cp gi ng xung tc

cao, l gii php mang tnh t ph v mt cng ngh v c pht trin trn c s ca

h thng 3G WCDMA, c ti u-ha cho cc ng dng d liu chuyn mch gi.

Cng ngh HSDPA hin nay cho php tc download t n 1.8 Mbps, 3.6Mbps,

7.2 Mbps v 14.4 Mbps, v trong tng lai gn, tc hin nay c th c nng ln

gp nhiu ln a n mt hiu qu s dng tt hn. Cc thu bao dch v HSDPA

c th nhn email vi tp tin nh km mang dung lng ln, lt web hoc ti v cc

tp tin a phng tin hoc vn bn nhanh hn bao gi. Mc d c th truyn ti bt

c dng d liu no, song mc tiu ch yu ca HSDPA l d liu dng video v nhc.

Khi nim HSDPA c pht trin da trn cng ngh W-CDMA, s dng cc

phng php chuyn i v m ha d liu khc. N to ra mt knh truyn d liu

bn trong W-CDMA c gi l HS-DSCH (High Speed Downlink Shared Channel),

knh chia s ng xung tc cao. Knh truyn ti ny hot ng hon ton khc

bit so vi cc knh thng thng v cho php thc hin download vi tc vt

tri. V y l mt knh chuyn dng cho vic download. iu cng c ngha l d



29/58


liu s c truyn trc tip t ngun n in thoi. Song qu trnh ngc li, tc l

truyn d liu t in thoi n mt ngun tin th khng th thc hin c khi s

dng cng ngh HSDPA. Cng ngh ny c th c chia s gia tt c cc ngi

dng c s dng sng radio, sng cho hiu qu download nhanh nht.

Ngoi ra HSDPA cn s dng iu ch v m ho thch ng (Adaptive

Modulation and Coding), HARQ nhanh (Hybrid Automatic Repeat Request), v lp

lch gi (Packet Scheduling) nhanh. Nhng tnh nng ny c phi hp cht ch v

cho php thch ng cc tham s truyn dn theo mi khong thi gian TTI nhm lin

tc hiu chnh s thay i ca cht lng knh v tuyn.

2.2 Nhng ci tin quan trng ca HSDPA so vi WCDMA

Hnh 11: Cc tnh nng c bn ca HSDPA khi so snh vi WCDMA

Trong WCDMA, iu khin cng sut nhanh nhm gi n nh cht lng tn

hiu nhn c (Eb/No) bng cch tng cng sut pht nhm chng li s suy hao ca

tn hiu thu c. iu ny s to ra cc gi tr nh trong cng sut pht v tng nn

nhiu a truy cp, do s lm gim dung lng ca ton mng. Hn th na, s hot

ng ca iu khin cng sut yu cu lun lun phi m bo mt mc d tr nht



30/58


nh trong tng cng sut pht ca Node B thch ng vi cc bin i ca n. Loi

b c iu khin cng sut s trnh c cc hiu ng tng cng sut k trn cng

nh khng cn ti d tr cng sut pht ca t bo.

Tuy nhin, do khng s dng iu khin cng sut, HSDPA yu cu cc k

thut thch ng lin kt khc thch ng cc tham s tn hiu pht nhm lin tc bm

theo cc bin thin ca knh truyn v tuyn.

Mt trong nhng yu cu thch ng lin kt s c cp trong khun kh bi

kho lun ny c gi l iu ch v m ho thch ng - AMC. Vi k thut AMC,

iu ch v t l m ho oc thch ng mt cch lin tc vi cht lng knh thay cho

vic hiu chnh cng sut. Truyn dn s dng nhiu m Walsh cng c s dngtrong qu trnh thch ng lin kt. S kt hp ca hai k thut thch ng lin kt trn

thay th hon ton k thut h s tri ph bin thin trong WCDMA do kh nng

thch ng chm i vi s bin thin ca truyn dn v tuyn tc cao.

Do HSDPA khng cn s dng iu khin cng sut vng kn, phi ti thiu

ho s thay i ca cht lng knh v tuyn trong mi khong thi gian TTI, vn

ny c thc hin nh vic gim rng ca TTI t 10 ms WCDMA xung cn

2ms HSDPA. Vi s b sung k thut HARQ nhanh, n cn cho php pht li mt

cch nhanh nht cc block d liu b mt hoc b li v kh nng kt hp vi thng

tin mm ln pht u tin vi cc ln pht li sau .

thu thp c thng tin v thng tin cht lng knh hin thi cho php cc

k thut thch ng lin kt v lp lch gi theo di gim st mt cch lin tc cc iu

khin v tuyn hin ti ca thu bao di ng, lp iu khin trung gian MAC th lm

nhim v gim st knh nhanh cho php B lp lch gi nhanh v c tnh chia s theothi gian ca knh HS-DSCH v bn cht c th xem nh phn tp la chn a ngi

dung vi nhng li ch rt to ln i vi vic ca thin thng lng ca t bo. Vic

chuyn dch chc nng lp lch n Node B l thay i chnh v kin trc nu so snh

vi phin bn R99 ca WCDMA.



31/58


2.3 Nguyn l hot ng ca HSDPA

Hnh 12 - Nguyn l hot ng c bn ca HSDPA

HSDPA gm cc gii php:

+ Thc hin an xen thi gian truyn dn ngn TTI=2ms

+ M ho v iu ch thch ng AMC

+ Truyn dn a m, lp vt l tc cao L1

+ Yu cu lp t ng lai H-ARQ.

Trong gii php HSDPA, thit b sp xp gi tin s c chuyn t b iu khin

mng v tuyn RNC ti Node-B nhm gip ngi s dng d dng truy nhp vo cc

chc nng thng k giao din v tuyn. K thut sp xp gi tin tin tin s gip iu

chnh c tc d liu ngi s dng sao cho thch hp vi cc iu kin knh v

tuyn tc thi.



32/58


Trong qu trnh kt ni, thit b ngi s dng (UE) s nh k gi mt ch

th cht lng knh CQI ti Node-B cho bit tc d liu no (bao gm k thut

iu ch v m ho, s lng cc m s dng) m thit b ny c th h tr khi

di cc iu kin v tuyn hin thi. ng thi, UE gi mt bo nhn(Ack/Nack) ng vi mi gi gip node-B bit c thi im lp li qu trnh

truyn d liu. Cng vi chc nng thng k cht lng knh tng ng cho tng

UE trong mt cell, Thit b sp xp gi tin s thc hin sp xp cc gi ca cc

UE mt cch cng bng .

Vn chng ta cn quan tm l cht lng knh ng truyn ca mi

ngi s dng c lp v cch xc nh n. V d nh: t l cng sut k hiu

trn tp nhiu ( t s Es/No), cht lng b tch UE. Nt B c th c lng tc

d liu c h tr cho mi UE bng cch gim st cc lnh iu khin cng

sut pht theo chu k mt gi tr ch th cht lng knh (CQI Channel Quality

Indicator) c th ca HSDPA trn knh iu khin vt l dnh ring tc cao

( HS-DPCCH) ng ln, knh ny cng mang c thng tin bo hiu chp nhn /

khng chp nhn (Ask / Nask) dng gi da trn L1 cho mi knh lin kt. Khi

c tnh c cht lng knh, h thng chia s ti nguyn m v cng sutHS-DSCH gia nhng ngi s dng khc nhau.

Lp iu khin truy nhp mi trng ( MAC Medium Access Control)

c t ti nt B, do cho php truy nhp nhanh hn ti cc gi tr o lng

tuyn kt ni, lp lch gi hiu qu hn v nhanh hn, cng nh c th kim

sot cht lng QoS cht ch hn. So snh vi k thut DMA truyn thng,

knh HS-DSCH khng thc hin vi iu kin cng sut pht nhanh v h s

tri ph c nh. Bng cch s dng k thut m ho Turbo tc thay i,

iu ch 16 QAM, cng nh hot ng a m m rng, knh HS- DSCH h tr

tc d liu nh t 120 Kbps ti hn 10Mbps. Qu trnh iu ch v m ho

thch ng c bn c mt di ng khong 20dB, v c m rng hn na s

a m kh dng.



33/58


Bng 3: Tc d liu nh ca HSDPA trong mt s trng hp

TFRCTc d liu

(1 m )

Tc d liu

(5 m)

Tc d liu

(15 m)

QPSK, t l m ho 1/2 120 kpbs 600 kbps 1.8 Mbps

QPSK, t l m ho 3/4 240 kpbs 1.2 Mbps 3.6 Mbps

16 QAM, t l m ho 1/2 360 kpbs 1.8 Mbps 5.3 Mbps

QAM, t l m ho 1/2 480 kpbs 2.4 Mbps 7.2 Mbps

QPSK, t l m ho 3/4 720 kpbs 3.6 Mbps 10.7 Mbps

T bng 3 ta c th phn no hnh dung c kt ni gia mt khun dng

truyn ti v kt ni ti nguyn (TFRC) c th v tc d liu nh tng ng.

2.4 Cu trc HSDPA

2.4.1 M hnh giao thc HSDPA

Hnh 13: Kin trc giao din v tuyn ca knh truyn ti HS-DSCH

Trong cu trc HSDPA, thit b sp xp gi tin s c chuyn t b iu khin

mng v tuyn RNC ti Node-B nhm gip ngi s dng d dng truy nhp vo cc

chc nng thng k giao din v tuyn. K thut sp xp gi tin tin tin s gip iu

chnh c tc d liu ngi s dng sao cho thch hp vi cc iu kin knh v

tuyn tc thi.



34/58


Nu nh tt c cc knh truyn ti theo kin trc R99, chng u chm dt ti

RNC th knh HS-DSCH li chm dt ngay ti Node B nhm mc ch iu khin

knh HS-DSCH, lp MAC-hs (lp iu khin truy cp trung gian tc cao), s iu

khin cc ti nguyn ca knh ny v nm ngay ti Node B. Do , cho php nhn ccbn tin v cht lng knh hin thi c th tip tc theo di gim st cht lng

knh hin thi c th lin tc theo di gim st cht lng tn hiu cho thu bao tc

thp. V tr ny ca MAC-hs ti Node B cng cho php kch hot giao thc HARQ

t lp vt l, n gip cho cc qu trnh pht li din ra nhanh hn.

Hnh 14: Cu trc lp MAC hs

c bit hn, lp MAC hs chu trch nhim qun l chc nng HARQ cho mi

user, phn phi ti nguyn HS-DSCH gia tt c cc MAC-d theo s u tin ca

chng ( v d nh lp lch gi), v la chn khun dng truyn ti thch hp cho mi

TTI (v d nh thch ng lin kt). Cc lp giao din v tuyn nm trn MAC khng

thay i so vi kin trc R99 bi v HSDPA ch tp trung vo vic ci tin truyn ti

ca cc knh logic.

Lp MAC-hs cng lu gi d liu ca user c pht qua giao din v tuyn,

iu to ra mt s thch thc i vi vic ti u ha dung lng b nh m caNode B.

Trong qu trnh kt ni, thit b ngi s dng (UE) s nh k gi mt ch th

cht lng knh CQI ti Node-B cho bit tc d liu no (bao gm k thut iu

ch v m ho, s lng cc m s dng) m thit b ny c th h tr khi di

cc iu kin v tuyn hin thi. ng thi, UE gi mt bo nhn (Ack/Nack) ng vi

mi gi gip node-B bit c thi im lp li qu trnh truyn d liu. Cng vi



35/58


chc nng thng k cht lng knh tng ng cho tng UE trong mt cell, Thit b

sp xp gi tin s thc hin sp xp cc gi ca cc UE mt cch cng bng .

2.4.2 Cu trc knh

Hnh 15: Giao din v tuyn ca HSDPA

Ti nguyn chung ca ngi s dng trong t bo bao gm cc b m knh

v cng sut pht. Khi nim HSDPA c gii thiu bao gm mt s knh vt lthm vo:

- Knh vt l chia s ng xung tc cao HS-PDSCH (High Speed Physical

Downlink Shared Channel)

- Knh iu khin vt l HS-DPCCH (HS-Physical Control Channel).

2.4.2.1 Knh vt l chia s ng xung tc cao: HS-PDSCH

Trong knh ny thi gian v m ho c chia s gia nhng ngi s dng gn

lin vi Node-B. y l c cu truyn ti cho cc knh logic c thm vo:

+ Knh chia s ng xung tc cao HS-DSCH (HS-Downlink Shared Channel)

+ Knh iu khin chia s tc cao HS-SCCH (HS-Shared Control Channel).

Nhng ti nguyn m ho HS-DSCH gm c mt hoc nhiu b m nh hng

vi h s phn b c nh SF 16. Phn ln 15 b m ny c th phn b cho nhng



36/58


yu cu v truyn dn d liu v iu khin. Cc ti nguyn m ho sn sng c

chia s ch yu trong min thi gian nhng n c th chia s ti nguyn m ho bng

cch dng m ho a thnh phn. Khi c thi gian v b m c chia s, t hai n

bn ngi s dng c th chia s ti nguyn m ho trong cng mt TTI.

Hnh 16: Thi gian v b m c chia s trong HS-DSCH

c tnh quan trng ca knh HS-DSCH l tnh linh ng ca ngun c chia

s trong khong thi gian rt ngn 2ms.Khi d liu ngi dng c t trn knh

HS-DSCH, chng lin tc c gi i trong khe thi gian 2ms .

Ngc li, vi phin bn R99 ca WCDMA cn c thm khong DTX - khong

truyn gin on nm trn khe DPDCH, n c tc dng lc nhiu trn ng truyn

nhng khng th t c tc ln nht. V R99 ra i vi mc tiu chnh l tng

dung lng h thng cho cc dch v thoi so vi h thng 2G (GSM) m thi ch

cha s t c nhng yu cu v k vng i dch v s liu v tc h tr d liu

cn thp (khong 384 kbps). i vi dch v thoi th chng ta bit, ngun ti

nguyn (m, cng sut, nhiu) yu cu truyn dn dch v ny l khng thay i (do

tc truyn dn l khng thay i) do iu khin cng sut thc s hiu qu v n

gim nhiu MAI lm cho dung lng knh thoi m h thng c th p ng trn mt

n v ti nguyn v tuyn tng ln.

Tuy vy khi trin khai cc dch v s liu ( File Transfer, Internet Access, E-

mail,) chng ta thy rng c th ca nhng dch v ny l yu cu ngun ti



37/58


nguyn rt ln v trong khong mt thi gian ngn. V d nh nu truy nhp vo mt

trang web no th cng mt lc ni dung vn bn v hnh nh ca website cn

truyn n my u cui trong mt khong nht nh. Sau khi ni dung trang web

download v my u cui th thng thng ngi s dng s xem ni dung v khngtruy nhp ti nguyn h thng na. Nhng dch v m yu cu ngun ti nguyn ln

v trong khong thi gian ngn nh vy trong k thut ngi ta gi chung mt tn l

bursty data service.

Vi knh HS-DSCH trong HSDPA th ngi ta cp pht 15 m tri ph vi h s

tri 16 dng chung gia cc my trong cng mt sector. Cc my c cp pht ti

nguyn trong tng khong thi gian nht nh (TDM). B scheduler s cp pht ti

nguyn: bao nhiu m tri ph, cng sut l bao nhiu ph thuc vo yu cu dch v,

trng thi knh ca user .

Hnh 17: Trng thi knh ca cc user

Nh hnh v trn, ti khong thi gian u tin User 1 c trng thi knh tt nn

b scheduler a ra quyt nh cp pht ti nguyn cho User ny. Khi quyt nh

cp pht ti nguyn cho User 1 ny k thut thch ng cng c p dng. Nu trng

thi knh ca User lc ny tt v nhu cu v tc truyn dn ln th my pht c th



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dng iu ch 16-QAM hoc m knh vi t l m ln truyn tc ln hn. n

khong thi gian th 2, User 2 s c cp pht truyn dn v User 2 c trng thi

knh tt hn nh trn hnh v. Bng vic cp pht ti nguyn ng, kt hp vi k

thut thch ng (ACM) chng ta c th thy rng knh truyn dn chung lun c chtlng knh mc tt c th hin ng nt t trn hnh v.

Ngoi d liu ngi s dng, Node-B cn thc hin truyn dn bo hiu iu

khin nhm thng bo sp xp cho ngi dng k tip. Bo hiu ny c sp xp

trong knh iu khin chia s tc cao (HS-SCCH), l knh dng chung cho cc

ngi s dng, v n c thc hin bng cch truyn dn hai khe thi gian HS-

SCCH TTI. Knh HS-SCCH mang nhng thng tin sau:

- Mt l ID ca nhng ngi dng c trng UE. Nhim v chnh ca mt l l

xc nh ngi dng c phc v trong chu k TTI tip theo.

- Thng tin lin quan n khun dng truyn ti, m t cc m nh knh,

phng thc k thut iu ch c s dng. T l m ho c trch ra t kch c ca

block truyn ti v cc tham s khun dng truyn ti khc.

- Thng tin lin quan n HARQ: c th l chu k pht tip theo s l mtblock mi hay l mt block c pht li (do c th gp li trc nn yu cu pht

li) v thng tin v cc phin bn.

Thng tin iu khin ny ch c s dng cho cc UE s c phc v trong

chu k tip theo, nh vy knh bo hiu ny l mt knh chia s theo thi gian cho tt

c cc user.



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Hnh 18.1 : H thng trong tr ng hp 1 knh HS-SCCH v

phn chia a thi gian

Hnh 18.2: H thng trong trng hp nhiu knh HS-SCCH v

phn chia a thi gian

RNC cng c th ch r cng sut c khuyn ngh cho HS-SCCH ( lch lin

quan ti cc bit hoa tiu ca ca knh DPCH kt hp). Cng sut pht ca HS-SCCH

c th l hng s hoc thay i theo thi gian tu theo mt chin lc iu khin cng

sut no cho HS-DCCH.

2.4.2.2 Knh iu khin vt l tc cao: HS-DPCCH

y l knh ng ln, c s dng mang tn hiu bo nhn (ACK) n Node-

B trn mi block. N cng c dng ch th Cht lng knh CQI (Channel

Quality), l yu t c s dng trong AMC.

Hnh 19: Cu trc knh HS-DPCCH



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Knh HS-DPCCH dng c nh h s phn b 256 v c mt khe cu trc c

rng l 2/3 ms.

+ Khe u tin c s dng cho thng tin v HARQ.

+ Hai khe cn li c dnh cho CQI.

Thng tin v HARQ lun lun c gi khi m knh HS- SCCH gii m chnh

xc nhn ng tch sng xung trong khi QCI truyn tn s c iu khin bi

thng s k.

C 2 khe u hot ng ring bit lp iu khin. V d, trong mt s trng

hp, qu trnh lp li ny din ra vi chu k 2 ms v hot ng cnh ca t bo khi

cng sut hin ti khng chc chn cho qu trnh lp li. Cng sut iu khin t

nhng t bo HSDPA cng c th lm gim bt cng sut nhn t knh HS-DPCCH

trong qu trnh chuyn giao trong min nh nh thit b u cui lm gim cng sut

truyn nu mi t bo hot ng gi mt lnh yu cu.

Nh vy l vic khng dng iu khin cng sut m iu khin cp pht ngun

ti nguyn s lm cho dung lng h thng tng nh li dng c tnh bin i ca

knh fading. R rng bng vic s dng iu khin truyn dn lm thay i cchnhn v fading. Nu trc y chng ta coi l mt nhc im ca mi trng

truyn dn h v tm cch trnh, xa b th by gi chng ta li c nh n do chng

ta hiu v s dng n ng tnh hung.

Dung lng ca h thng theo phng php ny cng tng nu nh mt thu

bao trong sector cng cao v vi nhiu User phn b u tt c cc v tr trong cell th

bt c thi im no cng c t nht mt User c trng thi knh cc tt truyn

dn vi tc cc ln. tng dung lng ny ngi ta thng nhc n vi tn gi

phn tp a ngi s dng- Multi-User Diversity. Tuy nhin c ngi s t ra mt

cu hi l: Nu b scheduler quyt nh cp pht ti nguyn da trn trng thi knh

ca my u cui th s c trng hp c User s khng truyn dn c trong mt

khong thi gian di v User ny lun trng thi knh km hn nhng User khc?.

Thc mc ny hon ton hp l. V n dn n vn cn bng gia dung lng h

thng v s tha mn i vi ngi s dng. S tha mn y ngha l khng



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mt User phi i qu lu mi c truy nhp h thng. t c yu t cn bng

ny cc b scheduler c thit k ngoi da trn nguyn tc trn cn phi kt hp

vi nguyn tc Round-Robin (first come, first serve). V mi nh sn xut thit b s

c nhng la chn thit k khc nhau ch khng nh sn xut no ging nh sn xutno v bn thn vn ny ch c a ra nguyn l trong 3GPP v 3GPP2 ch

khng chun ha thnh mt k thut c bit c th.

Mt iu th v khc na cn phi nhc n l khng dng iu khin cng sut

m iu khin thu pht c ng lc tt i vi s pht trin ca th trng my u

cui. iu ny c th c gii thch nh sau: Khi iu khin thu pht, b lp lch gi

da vo nhng thng tin trng thi knh do MS gi v (Channel Quality Indicator

Channel). M thng th MS s da vo tham s SIR (Signal to Inteference Ratio)

yu cu b lp lch cp pht ti nguyn. Do , my di ng cng hin i ngha l kh

nng nn nhiu cng ln (ngha l SIR ln) th b lp lch cp pht v iu khin BTS

pht vi tc cao hn. Nh vy nu khch hng u t my u cui hin i s

c li ch khng phi l h iu hnh hng li nh s dng iu khin cng sut

V vi iu khin cng sut, nu my u cui tt, BTS yu cu MS gim cng sut

pht, do nhiu gim v dung lng h thng tng. Khi dung lng tng l li chca h iu hnh ch khng phi l li ch ca ngi s dng. Vi li ch thuc v

khch hng nh vy c th ni y l yu t kch thch qu trnh tiu th my u cui

si ng hn.

2.5Cc k thut s dng trong HSDPA

2.5.1iu ch v M ho thch ng. K thut truyn dn a m

Trong thng tin di ng, t l tn trn tp (SINR) ca tn hiu nhn c ti mtthit b ngi s dng lun bin i trong khong t 30 40dB do fading nhanh v

cc c im v a hnh trong mt cell. Nhm ci thin dung lng ca h thng, tc

d liu nh, vng ph sng tn hiu truyn ti ngi dng c xc nh nhm

tnh ton qu trnh thay i cht lng tn hiu thng qua qu trnh x l lin kt thch

ng. Theo truyn thng, WCDMA ng dng chc nng iu khin cng sut nhanh

cho cc lin kt thch ng. Ngc li, HSDPA lu cng sut pht khng i qua TTI



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ng thi s dng iu ch thch ng v m ho (AMC) nh mt phng php lin kt

thch ng an xen nhm iu khin cng sut ci thin hiu sut ph.

T s tp m v nhiu c xc nh bi cng thc:

116

1

1SFR

+

=

GP

PSIN

ovvn

DSCHHS

Trong ,

PHS-DSCH , Pown : cng sut truyn v cng sut mang node B HS-DSCH

Hng s =0.5, Pown = 12W, G= -3dB

i ph vi di ng ca t s tp m trn nhiu Eb/No ti u cui UE,

HSDPA thch ng qu trnh iu ch, t l m ho v s m ho nh knh vi cc

iu kin v tuyn hin thi. S kt hp ca hai phng php trn gi l: iu ch v

M ho thch ng AMC

Bn cnh QPSK, HSDPA cn kt hp cht ch vi phng thc iu ch

16QAM tng tc d liu nh ca cc user c phc v vi iu kin vo tuyn

thch hp. Vic h tr cho QPSK c tnh cht bt buc i vi thng tin di ng, cn

i vi 16QAM l mt tu chn cho mng v thit b ngi dng UE.

S dng ng thi c 2 phng thc iu ch ny, c bit l phng thc iu

ch cp cao 16 QAM, a ra mt s thch thc nht nh i vi phc tp ca b

thu u cui, n cn phi xc nh c bin tng ng ca cc k hiu nhn c,

trong khi i vi phng php iu ch QPSK truyn thng ch yu cu tch pha tn

hiu. Mt b m ho Turbo da trn b m ho Turbo R99 vi t l m ho 1/3, mc

d cc t l m ho hiu dng khc trong phm vi (xp x 1/6 n 1/1) cng c th cc bng cc k thut ghp, trch, lp m. Kt qu l to ra mt di t l m c ti 64

gi tr khc nhau. S kt hp ca mt kiu iu ch v mt t l m c gi l Lc

m ho v iu ch

Ngoi k thut iu ch v m ho thch ng AMC, pht a m cng c th coi

nh l mt cng c thch ng lin kt. Nu nh user c y cc iu kin knh v



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tuyn thch hp, node B c th li dng iu kin ny bng cch pht nhiu m song

song vi nhau, nhm t c thng lng d liu nh kh ln.

Vi k thut pht a m, ton b di ng AMC c th c tng ln mt lng:

10log 10 15 ~ 12 dBs

Ton b di ng thch ng lin kt do AMC kt hp pht a m xp x 30 dB.

Node- B s xc nh tc truyn dn d liu da trn cc bo co v ch th

cht lng knh CQI cng nh cc thng k cng sut trn cc knh dnh ring. Tc

d liu c iu chnh bng cch thay i s iu ch, tc m ho cng nh

s lng m ho knh HS-PDSCH. S dng iu ch thch ng v m ho AMC cho

php ngi s dng tin gn hn ti Node- B, c th yu cu iu ch vi t l m ho

cao hn (chng hn nh iu ch 16- QAM vi t l m ho 3/4).

Bng 4: Lc m ho iu ch ca HSDPA v tc bit ti a kh dng

vi mi m

TFRC ModulationEffective Code Rate

(ECR)

Instanteaneous Data Rate with 1

HS-PDSCH code

#00 QPSK 0.14 68.5 kbps#10 QPSK 0.27 128.5 kbps

#20 QPSK 0.39 188.5 kbps

#30 QPSK 0.52 248.5 kbps

#40 QPSK 0.64 308.0 kbps

#50 QPSK 0.77 368.5 kbps

#00 16 QAM 0.32 302.5 kbps

#10 16 QAM 0.38 362.0 kbps

#20 16 QAM 0.45 433.0 kbps#30 16 QAM 0.54 518.0 kbps

#40 16 QAM 0.65 619.5 kbps

#50 16 QAM 0.77 741.5 kbps



44/58


Hnh 20: Biu din m ho iu ch ca HSDPA v tc bit ti a kh dng

vi mi m theo dB

2.5.2 K thut H- ARQ

Khi vn hnh HSDPA ln cn hiu sut ph cao nht, t l li khi BLER sau

ln truyn dn u tin c khuyn ngh trong khong t 10- 20%. C ch yu cu

lp t ng lai H-ARQ c ng dng trong gii php HSDPA nhm gim tr v tng

hiu sut ca qu trnh ti truyn dn d liu. Thc t, H- ARQ l mt giao thc dng

dng li v ch SAW (Stop And Wait).

Trong c ch SAW, pha truyn dn lun lun qu trnh truyn dn cc block

ang hin hnh cho ti khi thit b ngi s dng hon ton nhn c d liu. tn

dng thi gian khi Node- B ch cc bo nhn, c th thit lp N tin trnh SAW-ARQ

song song cho thit b ngi dng. Do , cc tin trnh khc nhau truyn dn trong

cc TTI ring bit. S tin trnh SAW-ARQ song song c thit lp ti a l 8 (N=8),

tuy nhin thng thng chn gi tr N t 4-6. Thi gian tr nh nht cho php gia qu



45/58


trnh truyn d liu gc so vi qu trnh ti truyn dn d liu ln u tin trong

HSDPA l 12ms.

iu khin H- ARQ lp 1 c t ti Node-B, do vic lu tr cc gi d liu

phi bo nhn cng vi chc nng sp xp cc gi ca qu trnh ti truyn dn l khng

ph thuc vo RNC. Nh vy s trnh c tr ti truyn dn, ngoi ra cc tr ny s

thp hn tr gy ra bi qu trnh ti truyn dn RLC thng thng.

K thut HARQ l im khc c bn so vi k thut pht li trong WCDMA

bi b gii m UE kt hp cc thng tin mm ca qu trnh pht li ca cng

mt block cp bit. K thut ny a ra mt s yu cu v m rng dung

lng b nh ca UE, do UE phi lu cc thong tin mm ca nhng ln phtgii m khng thnh cng.

Hnh 21: Hot ng ca giao thc SAW 4 knh

Cc phng php HARQ nh sau:

-Kt hp khun (CC: Chase Combining) mi ln pht li ch n gin l s lp

li ca t m c s dng cho ln pht u tin.

u im: Vic truyn v truyn li c gii m ring l (t gii m), tng

tnh a dng thi gian, c th tng tnh a dng ng truyn.

Nhc im: Vic pht li ton b cc gi s lng ph v bng thng.



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- Tng d(IR : Incremental Redundancy): S pht li bao gm c thng tin

d tha b xung v thng tin ny c pht km thm nu c li gii m trong ln

pht u tin.

Hnh 22: Qu trnh truyn li khi d liu IR

Tng d c s dng nhn c tnh nng ti a trong bng thng sn

sng. Lc ny block c pht li ch bao gm d liu sa cha ca tn hiu gc c

truyn i ch khng phi thng tin thc s. Lng thng tin d thm vo c gi ingy cng tng ln khi qu trnh pht li lp i lp li m bn thu vn nhn b li.

u im: Gim bt bng thng/ lu lng hu dng ca mt ngi s dng

v dng n cho nhng ngi khc.

Nhc im: Cc bit h thng ch c gi i khi truyn ln u v khng

th truyn li, iu lm cho qu trnh truyn li khng th t gii m. V

th, nu qu trnh truyn ln u b mt th fading rt ln s tc ng vkhng c c hi khi phc li d liu trong hon cnh ny.



47/58


Chng 3 : NG DNG TRN HSDPA

3.1 VOIP song cng ton phn v thc y tr chuyn

Khi so snh vi nhiu ng dng khc chy qua IP, lu lng yu cu cho

VoIP song cng ton phn thp, ln trn ti vi chc Kbps, nhng nhng yu

cu tim n mt khc li i hi cao hn, nh vy mt ln na , RTT v khng

phi lu lng ni lin kt- l nhn t m ngi dng cui gii hn dch v thc

hin v dung lng mng. Khuyn co ITU trong thi gian truyn mt ng cho

ting ni song cng ton phn ni rng ngi s dng tha mn vi tr truynt ming n tai khong 280ms. Vi tr ln hn 280ms th s tng tc ca

kt ni ting ni gim nhanh chng.V khi tr t n 400ms th ting ni

khng tha mn vi s tng tc kt ni. Ch rng tr c ni n y l

tr t ming n tai, v do khng ch bao gm tr ng truyn m cn

c tr x l (m ha/ gii m) trong b pht v b nhn. Khuyn co ca lin

hip vin thng quc t ngoi ra cng bao gm hng dn cho tr m ha / gii

m. Vi a s cc b ly mu dng cho di ng yu cu tr ch t 50ms n

100ms. B qua tr x l th tr t lc truyn tin cho n khi kt thc l nh

hn 200ms. Khi chng ta so snh yu cu tr ny vi RTT thp hn 200ms

trong WCDMA v thp hn 100ms trong HSPA. R rng rng VOIP lm vic tt

trong c 2 cng ngh.Vi RTT ngn hn trong lin kt v tuyn HSPA, tr cho

php trong ng truyn HSPA l ln hn so vi WCDMA. Ch rng khi ti

HSPA tng ln th RTT cng tng.

Vi cc ng dng thc y tr chuyn th tr yu cu t ming ti tai l t i

hi cao hn so vi VOIP song cng ton phn. Mt khc, nhng ng dng ny t

nhng yu cu cht ch trn vic thit t thi gian cho kt ni v tuyn. iu ny l

bi v mi thi gian ngi s dng yu cu tr chuyn, h thng phi thit t mt kt

ni v tuyn, thi gian lm iu ny trc tip nh hng n ngi dng kt ni

ti cuc tr chuyn.



48/58


3.2 Tr chi vi thi gian thc

C nhiu nhm tr chi mng, v cc nhm ny c yu cu khc nhau trn mng

di ng, nhng yu cu ny ph thuc thi gian thit lp kt ni v tuyn v tui th

ca pin. Di y l cc v d v cc nhm tr chi

Nhng tr chi hot ng thi gian thc.

Nhng tr chi chin lc thi gian thc.

Nhng tr chi chin lc trn nn quay.

Yu cu cht ch nht l cc tr chi hot ng thi gian thc. Trong khi tc

truyn theo bit ti a ca nhng tr chi hot ng nh vy him khi vt hn 100-

200 kbps v tc truyn theo bit trung bnh thng khong 10- 30 kbps. RTT yu

cu tr in hnh 125-250ms cho nhng tr chi i hi cao nht. Do , HSPA s

c kh nng h tr vic chi trn nn hot ng vi s np thc hin min l mng

ngi dng cui kim sot tt. Yu cu tc d liu cho nhng tr chi hot ng

thi gian thc thay i rt nhanh. HSPA c u im hn so vi Release 99 v tc

d liu c th c p ng ngay lp tc.

3 .3 Lung TV di ng

Vic cung cp lung video c cht lng tt i vi mt mn nh di ng s

dng b ly mu video gn y nht yu cu tc t 32 n 128 kbps ph thuc vo

ni dung. a s nhng kiu ni dung mang dung lng 64 Kbps cht lng s

tt.Cc mng WCDMA c th cung cp 64-128kbps vi cht lng rt tt. Tuy nhin,

ci m HSPA mang l nhiu kh nng hn, m ln lt cho php th trng tc

truyn theo bit cao ti nhng ngi dng cui.Nhng mng v tuyn trc th h 3G. th ch t c tc d liu 50- 200

kbps, trong khi 3G mng vi kh nng HSDPA c th cung cp nhng tc d liu

ln ti 1 Mbps. Do , cc ng dng lung phi lm thch nghi tc phng tin

truyn thng. S thch nghi tc phng tin truyn thng lung c h tr

trong mt s thit b u cui, trong khi s h tr y ca 3 GPP tiu chun ha

s thch nghi tc phng tin truyn thng c bao gm vo 3 GPP ln thnh



49/58


phin bn R6. la chn tc phng tin truyn thng thch hp ngi phc v

lung cn phi bit:

- Loi trm di ng no hng ti. Trong trng hp l mt thit b u cui

vi nhng kh nng tc truyn theo bit hn ch, tc phng tin truyn thng

cn phi tnh n nhng hn ch .

- Tc phng tin truyn thng ban u no cn phi c s dng c th

trong mt mng 2G, v i khi n c th trong mt mng 3G

- Khi no tng hay gim bt tc phng tin truyn thng.

Trong thc t, trm di ng v thng tin trao i ngi phc v v nhng kh

nng ca h trc khi lung bt u. iu ny nh th no th bc 1 c gii

quyt. S chn lc nhp phng tin truyn thng ban u kh khn hn. Trong

mng ngy nay n da vo m hnh mng in thoi. Khi tc truyn theo bit ca

cc gii php dch v c t trong nhng thit b u cui v cc mng WCDMA

v HSPA ri tc truyn theo bit c th c s dng hng dn s chn lc

nhp phng tin truyn thng ban u.

3.4 Email

Cc gi tr tr trong mng HSPA thng thp cho cc ng dng th in t.

Thm ch nu ngi s dng khng ti cc file nh km hoc gi th in t, ng

dng th in t dng gi tin nhn ti in thoi di ng:

- Tiu th v vi KB u tin ca mi email nhn c c y ti thit b

u cui.

- Gi cc tin nhn hot ng c trao i gia my ch v thit b u cui.

Kch thc ca cc tin nhn c gi l rt nh.

Hnh 23 cho ta mt c lng tiu th cng sut ca in thoi di ng trn

nhng tin nhn c gi li c mI 4 pht v nhn 0 50 tn nhn email 1 gi .



50/58


Hnh 23: c lng tiu th cng sut ca in thoi di ng

Vic gi cc tin nhn hot ng c mang trn cc knh RACH/FACH trong

khi cc phn ca tin nhn- ca 1 vi KB- c mang trn HS-DSCH

Vic tiu th cng sut ngun c trnh by trong hnh 23 . Tiu th

ngun ph thuc vo s lng tin nhn nhn c v cc thng s thit t trn

mng v tuyn. Nu chng t gi s cc ng h 5-sec DCH v FACH 50 tin

nhn 1 gi, thit b di ng chun l 53h s s dng 1000mAp cng sut pin. S

tnh ton ny chng minh rng cc thng s trong ng dng y email tt trong

mng v tuyn.



51/58


Hnh 24: Truy cp email t mobile s dng pin 1000-mAh

Nu trng thi PCH khng c s dng bi mng, UE c di chuyn t FACH

ti trng thi ri v kt ni RRC c gii phng. Khi d liu ti ng xung t li

mng 3G , kt ni RRC cn c chim gi. Kt ni RRC thit t cc th tc c thtng tiu th cng sut u cui v gim thi gian chun s dng pin. S dng trng

thi PCH l c li t c thi gian chun s dng di.



52/58


KT LUN

Chnh thc c a vo hot ng ln u tin vo nm 2005, tnh n cui

nm 2006 c 19 nh cung cp 66 sn phm ng dng cng ngh HSDPA, trong

c 32 sn phm in thoi di ng.

u th ca HSPA khi hin ti c trin khai ti khong 150 mng trn 60

quc gia v 25 nh khai thc trin khai HSPA tc 7.2Mbps. Ngoi ra, gii php

ny cn nhm cung cp cc gii php ti u ha chi ph, tit kim chi ph u t

hiu qu hn chi ph lp t thit b trin khai nh cc nh khai thc c th cung

cp dch v cho nhiu i tng a dng hn

Vi nhng ci tin mang tnh t ph, HSDPA l mt cng ngh ang c ch

trng pht trin. Trn thc t, th trng ca HSDPA pht trin mnh m nht, c bit

l giai on khi u, l nhng nc pht trin, ni c lng khch hng khng l

s dng in thoi di ng cht lng cao. L do l v nhng chic in thoi HSDPA

s c gi thnh cao hn hn nhng chic in thoi thng thng c nhm vo th

trng nhng nc pht trin thp hn.Nhu cu s dng in thoi HSDPA c mong i l s t con s 2100 sn

phm tnh n cui nm nay. n nm 2010, con s ny c th l 100 triu chic, theo

phn tch ca IDC. Hn na, theo Strategic Analytics, n nm 2010, 70% in thoi

3G s s dng HSDPA.

Tuy nhin, s mt nhiu thi gian HSDPA thc s tr nn ph bin. Tnh n

cui nm 2005, hu ht cc nc trn th gii khng c mng 3G. Rt nhiu nh cung

cp dch v di ng ang c gng trin khai mng 3G v c th c nng cp thnh

mng 3.5G theo nhu cu ca th trng.



53/58


PH LC

MT S SN PHM IN THOI DI NG C TCH HP HSDPA

Cc sn phm ca HTC:

HTC Touch Dual

L mt sn phm mn hnh cm ng em li cho ngi s dng nhng tri

nghim mi v thay i cch s dng in thoi thng thng..

HTC P6500 Sedna

HTC Sedna s hu mt cu hnh n tng v thc s l mt trong nhng thit b

mnh m nht. Mn hnh 3,5 inches c o s hu dng khi hin th nhng bc nh

ln. Hn na, mn hnh cm ng chng la ny cng khin chic in thoi tr nn

c bit hn.

L mt chic in thoi Quadband GSM v thm c gi cng ngh CDMA tri-

band, Sedna c th tng thch vi hu ht cc mng di ng hin nay. Thit b nycn cung cp c nhng gii php qun l d liu, vi kt ni HSDPA l gii php quan

trng nht. S l mt iu ng tht vng nu khng c chc nng ny, khi tc

truyn d liu nhanh l v cng quan trng vi mt thit b cm tay mnh m. V vy,

hon thin, HTC Sedna cn c c kt ni wi-fi v bluetooth 2.0.



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HTC S730

HTC S730 l mt sn phm smartphone mnh m v snh iu vi bn phm

slide QWERTY t ng gip son tin nhn v vn bn nhanh chng v hiu qu. Vi

HTC S730, T10ngi s dng lun c update emails, tin nhn, cuc hn, cc cuc

gi nh nh mn hnh HTC Home.

Cc sn phm ca Sony Ericsson:

Sony Ericsson V640i

V640i l mt chic in thoi c to ra phc v cc thng yu nhc

vi kh nng chi nhc hon ho v mnh m. Nng ch 97g, W640i s dng

ng truyn bng thng rng 3G HSDPA, cho php download mt bn nhc trn

vn ch trong 14 giy.

Sony Ericsson vW910

W910 l mt chic in thoi HSDPA Walkman c thit k ch yu cho

nhu cu gii tr, vi kh nng chi nhc, game 3D, video, v lt web vi tc

cao. Chc nng Shake control cho php bn la chn nhng bn nhc yu thch

theo cch rt ring.

Sony Ericsson K850

Sn phm Sony Ericsson K850 li l mt chic in thoi chp nh chuyn

nghip. Vi camera 5MP c tch hp trong mt thn hnh mnh mai, chic in

thoi ny cho php bn chp nhng bc nh vi cht lng tt nht. K850 l mt sn

phm tri-band HSDPA v quad-band GPRS/EDGE.

Sn phm Nokia:

Nokia E51

Nokia E51 c trang b thm kh nng x l tc cao hn v tch hp nhiu

hn nhng ng dng ch cht. Trong khi , tnh nng smartphone v thit k y

phong cch m khch hng lun ch i E series vn c duy tr.



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Nokia N95 8GB

c coi l chic in thoi a nng mnh m nht, gi y, khi c nng cp

vi phin bn 8GB, Nokia N95 8GB tr nn mnh m hn rt nhiu. My c s hu

camera 5MP vi ng knh Carl Zeiss thi thng. Ngoi ra, chic in thoi ny cn

c tch hp A-GPS, WLAN, HSDPA v mt phong cch trt i rt n tng.

Nokia 6121 classic

Nokia 6121 classic l mt smartphone rt linh hot, s dng mng GSM v W-

CDMA 900/100. c tch hp camera 2MP, ng knh 4X-digital zoom, n flash v

ch thu hnh ton cnh, Nokia 6121 classic s cho ngi s dng nhng bc nh

hi lng nht. Ngoi ra, chic in thoi ny cn c mt camera th hai pha trc,phc v cho nhng cuc gi video.

Sn phm ca Samsung:

Samsung SGH-F330

Ging nh nhiu mu in thoi khc ca Samsung, SGH-F330 c kiu dng bt

mt vi thit k gn gng, mm mi v s kt hp 2 mu xanh - trng rt snh iu.

Ngoi ra, sn phm mi ny ca Samsung cn tch hp cng ngh 3G, c tc

truyn ti d liu ln n 3.6 Mbps vi cng ngh HSDPA. Mn hnh 2,1 inches ca

SGH-F330 c phn gii 240 x 320 pixels.



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Samsung SGH-i620

Samsung SGH-i620 l mt chic in thoi a chc nng tch hp wi-fi,

HSDPA v hot ng c trn mng tri-band GSM. My c camera VGA pha

trc v camera 2MP bn cnh, p ng nhu cu chp hnh v gi in video

ca ngi s dng.

Sn phm ca LG

LG KS20

LG KS20 c thit k nh gn, ch dy 12,8mm, hp thi trang vi mn hnh

cm ng 2,8 inches, camera 2.0 MP, nghe nhc, xem video vi loa ngoi cho m thanh

cht lng cao cng vi cng bluetooth 2.0 cho php truyn v nhn d liu nhanh

hn. c bit, trong sn phm ny LG tch hp thm cng ngh HSDPA , cng ngh

mi trong lnh vc truyn thng 3G cho php truy nhp internet qua mng di ng vi

tc cao.



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LG KU950

LG KU950 l mt chic in thoi TV c thit k dng T-slide cho php ngi

s dng thoi mi nht khi xem cc chng trnh truyn hnh v cc chng trnh pht

sng media wireless trn mn hnh xoay QVGA 2,4 inches. My c tch hp camera

1.3 MP, my chi nhc, bluetooth v khe cm th SD.

NoteBooks:

Fujitsu Siemens Computers l nh sn xut th hai trn th gii ng dng

UMTS Module vo cc sn phm notebook ca mnh. Chic notebook Lifebook

Q2010 khng ch l mt sn phm notebook n thun, n cn c chc nng nh mt

chic in thoi. Ngoi ra, mt s sn phm ng dng UMTS ca Fujitsu Siemens cnc: LIFEBOOK P1610, T4215, E8210, AMILO Pro 3525, 3545 and AMILO Si 1848.

K t nm 2005, Dell bt u sn xut laptop c tch hp HSDPA, cho php

my c kh nng kt ni Internet lin tc thng qua mng 3.5G ca Vodafone ti Anh

quc v mt s quc gia khc. Cc sn phm HSDPA ca Dell gm c: Latitude

D420, D430, D620, D630, D631, D820, D830, D831, v XPS M1210, M1330,

M1770, M2010, M4300 v M6300. Cc model D620, D820 v XPS M1210 cng ccung cp th trng M. Cc khch hng y s c s dng HSDPA do AT&T

Wireless cung cp.

Lenovo cng bt u sn xut cc sn phm c ng dng cng ngh HSDPA

k t gia nm 2006 vi nhng sn phm notebook mang thng hiu Lenovo v IBM

ThinkPad.

Ngoi ra, trn th trng hin nay cng c mt s hng sn xut cung cp cc

sn phm notebook c tch hp ng dng HSDPA nh Panasonic vi sn phm

Toughbook hay V33i ca hng Flybook. HP v Intel cng ang c nh a ng

dng ny vo cc sn phm sp ra mt ca mnh.



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TI LI U THAM KHO

[1]. Juha Korhonen. Introduction to 3G Mobile Communications 2ed. 2003

[2]. Harri Holma and Antti Toskala, HSDPA/HSUPA for UMTS / High Speed Access

Mobile Communications. Wiley. 2006

[3]. M.R Karim . Mohsen Sarraf. WCDMA and cdma2000 for 3G Mobile Networks.

McGraw Hill Telecom. 2002

[4 ]. TS Trnh Anh V Thng tin di ng- NXB H Quc Gia H Ni - 2007

[5]. KS Bi Vn Ph, KS. Phm Vnh Ho, KS. Nguyn Huy Qun, KS. Phm Bo

Sn. H thng a truy cp v tuyn 3.5G vi cng ngh HSDPA. Bi bo.

[6 ] http://www.searchmobilecomputing.techtarget.com

[7]. http://www.tapchibcvt.gov.vn

[8]. http://www.itgatevn.com.vn
http://www.searchmobilecomputing.techtarget.com/http://www.tapchibcvt.gov.vn/http://www.itgatevn.com.vn/http://www.searchmobilecomputing.techtarget.com/http://www.tapchibcvt.gov.vn/http://www.itgatevn.com.vn/

Luan Van Tham Khao -HSDPA

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