hoàn chỉnhsdf

8/2/2019 Hon chnhsdf

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LI NI U

Thng tin di ng pht trin rt nhanh, theo hip hi vin thng quc t (ITU)

s thu bao in hoi di ng ton cu hin t mc 4,6 t thu bao v dng rng

ri th h th ba (3G), c th cung cp a dng dch v vi tc cao, cht lng

cao, v ang hng n 4G.

Cc mng 3G trin khai nhiu nc trn th gii, ngay c trc khi chng

c khai thc, cc hot ng nng cp chng c quan tm n cng tc

th h ba (3GPP The Third Generation Partnership Project). Khong 10 nm

trc, s thu bao di ng 3G trn ton th gii khong trn 300 triu, nhng n

nm 2007 ln ti 3,1 t v hin nay l 4,6 t (ngha l hn mt na s dn trn

th gii).Theo thng k, hin trn th gii c khong hn 300 mng UMTS, trong c hn 35 mng HSPA ang hot ng, vi hn 200 triu khch hng. Ni cch

khc, gn 40% thu bao 3G trn th gii hin ang c s dng cng ngh truyn

ti d liu tc cao HSPA, ngoi ra n 2011 LTE giai on u ca 4G cng

s c trin khai.

Truy nhp gi ng xung tc cao (HSDPA High Speech Downlink

Packet Access) l mt m rng ca h thng 3G UMTS c th cung cp tc ln ti 10 Mbps trn ng xung. HSDPA l mt chun tng cng ca 3GPP

3G nhm tng dung lng ng xung bng cch thay th iu bin QPSK trong

3G UMTS bng 16QAM trong HSDPA. HSDPA hot ng trn c s kt hp

ghp knh theo thi gian (TDM) vi ghp knh theo m v s dng AMC

(Adaptive Modulation and Coding m ha knh v iu bin thch nghi).

m bo tc truyn dn s liu.

Cc k thut tng t cng c p dng cho ng ln trong chun HSUPA

(High Speech Uplink Packet Access truy nhp gi ng ln tc cao) l cng

ngh mng di ng ra i sau HSDPA v c xem l cng ngh 3,5G. y l

cng ngh chim u th tc ng ln: t 1,4Mbps n 5,76Mbps. Ngc li

vi HSDPA, HSUPA s dng knh truyn nng cao tc ng ln E-DCH

(Enhanced Dedicated Channel) theo cc k thut tng t HSDPA. Mc tiu ch

yu ca HSUPA l ci tin tc ti ln cho cc thit b di ng v gim thi gian

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Danh mc hnh ve............................................................................................... 8

Chng I: L trnh pht trin thng tin di ng t 3G ln 4G 9

1.1. Kin trc chung ca mng thng tin di ng3G 9

1.2. Cc hn ch ca 3G.... 10

1.3. L trinh pht trin thng tin di ng t 3G ln 4G. 10

Chng II: Truy nhp gi ng ln tc cao . 12

2.1. Khc bit gia HSDPA v HSUPA 12

2.2. Lp biu chow HSUPA... 12

2.3. HARQ vi kt hp mm trong HSUPA.. 14

2.4. Kin trc mng c lp cu hnh E-DCH (v HS-DSCH)... 162.5. Knh ring tng cng E-DCH trong HSUPA.. 18

2.5.1. E-DCH v cc knh bo hiu... 18

2.5.2. iu khin cng sut trong E-DCH. 23

2.5.3. iu khin ti nguyn cho E-DCH.. 24

2.6. Khong thi gian truyn TTI...... 25

2.7. Th tc hot ng lp vt l 26

2.7.1. Th tc hot ng lp vt l cho giao thc HARQ. 26

2.7.2. Th tc lp vt l cho HARQ v chuyn giao mm 27

Ti liu tham kho.............................................................................................. 30

BNG THUT NG VIT TT

Thut ng Ting Anh Ting Vit

3G Third Generation Th h th ba

4G Fourth Generation Th h th t

3GPP3rd Generation Partnership

Project

n cc i tc th h th

ba

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3GPP23rd Generation Partnership

Project 2

n cc i tc th h th

ba 2

ACK Acknowledgement Cng nhn

ARQ Automatic Repeat-reQuest Yu cu pht li t ng

AWGN Additive Gaussian Noise Tp m Gauss trng cng

BPSK Binary Phase Shift KeyingKha chuyn pha hai trng

thi

BTS Base Tranceiver Station Trm thu pht gc

CDMACode Division Multiple

Access

a truy nhp phn chia theo

m

Cell Cellular

CS Circuit Switch Chuyn mch knh

DCCH Dedicated Control Channel Knh iu khin ringDCH Dedicated Channel Knh iu khin

DL Downlink ng xung

DPCCHDedicated Physical Control

ChannelKnh iu khin vt l ring

DPCH Dedicated Physical Channel Knh vt l ring

DPDCHDedicated Physical Data

ChannelKnh s liu vt l ring

DTCH Dedicated Traffic Channel Knh lu lng ring

DTX Discontinuons Transmission Pht khng lin tc

E DCH Enhanced Dedicated Channel Knh ring tng cng

FACH Forward Access Channel Knh truy nhp ng xung

F DPCH Fractional DPCH DPCH mt phn (phn on)

FDD Frequency Division DuplexGhp song cng phn chia

theo thi gian

FDMAFrequency Division Multiplex

Access


tn s

GSMGlobal System For Mobile

Communications

H thng thng tin di ng

ton cu

HARQHybrid Automatic Repeat

reQuest

Yu cu pht li t ng linh

hot

HS -

DPCCH

High Speed Dedicated

Physical Control Channel

Knh iu khin vt l ring

tc cao

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HS DSCHHigh Speed Dedicated

Shared ChannelKnh chia s ring tc cao

HSDPAHigh Speed Downlink Packet

Access

Truy nhp gi ng xung

tc cao

HSPA High Speed Packet Access Truy nhp gi tc caoHS

PDSCH

High Speed Physical

Dedicated Shared ChannelKnh chia s ring vt l cao

HS SCCHHigh Speed Shared Control

Channel

Knh iu khin chia s tc

cao

HSUPAHigh Speed Uplink Packet

Access

Truy nhp gi ng ln tc

cao

IP Internet Protocol Giao thc Internet

ITUInternational

Telecommunications UnionLin on Vin thng quc t

Iub Giao din c s dng thng tin gia nt B v RNC

Iur Giao din c s dng thng tin gia cc RNC

LTE Long Term Evolution Pht trin di hn

MIMO Multi Input Multi Output Nhiu u vo nhiu u ra

NCK Negative Acknowledgement Khng cng nhn

NodeB Nt B

OFDMAOrthogonal Frequency

Division Multiplexing Access


tn s trc giao

PDCCHPhysical Dedicated Control

ChannelKnh iu khin ring vt l

PDCPPacket Data Convergence

ProtocolGiao thc hi t s liu gi

PDSCH Physical Downlink SharedChannel Knh chia s ng xungvt lPDU Protocol Data Unit

Giao thc n v s liu

PS Packet Switch Chuyn gi knh

QAMQuadrature Amplitude

Modulationiu ch bin vung gc

QoS Quality of Service Cht lng dch v

QPSK Quadrature Phase Shift Kha chuyn pha vung gc

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Keying

RAN Radio Access Network Mng truy nhp v tuyn

RLC Radio Link Control iu khin lin kt v tuyn

RNC Radio Network Controller B iu khin mng v tuyn

RRC Radio Resource Controliu khin ti nguyn v

tuyn

RR Round Robin Quay vng

SC FDMA

Single Carrier Frequency

Division Multiple Accessa truy nhp phn chia theo

tn s n sng mang

SDMASpatial Division Multiple

Access


khng gianSNR Signal-to-Noise Ratio T s tn hiu trn tp m

TCP/IPTransmission Control Protocol

IP

Giao thc iu khin truyn

dn IP

TDD Time Division DuplexGhp song cng phn chia

theo thi gian

TDM Time Division MultiplexingGhp knh phn chia theo

thi gian

TD

SCDMA

Time Division SynhcronousCode Division Multiple

Access

a truy nhp phn chia theom ng b - phn chia theo

thi gian

TTI Transmission Time Interval Khong thi gian truyn

UE User Equipment Thit b ngi dng

UMTSUniversal Mobile

Telecommunications System

H thng thng tin di ng

ton cu

UTRA UMTS Terrestrial RadioAccess

Truy nhp v tuyn mt tUMTS

UTRANUMTS Terrestrial Radio

Access Network

Mng truy nhp v tuyn mt

t UMTS

WCDMAWideband Code Division

Multiple Access


m bng rng

VoIP Voice over IP Thoi trn IP

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DANH MC HNH V

Th t M t

Hnh 1.1Kin trc tng qut ca mt mng di ng kt hp c

CS v PSHnh 1.2 Lich trinh ngin cu pht trin trong 3GPP

Hnh 1.3 L trnh pht trin t 3G ln 4G

Hnh 2.1 Chng trnh khung lp biu ca HSUPA

Hnh 2.2 Cc pht li trong chuyn giao mm

Hnh 2.3 Kin trc mng c lp cu hnh E-DCH

Hnh 2.4 Cc knh cn thit cho mt UE c kh nng HSUPA

Hnh 2.5 Sp xp tch ring x l E-DCH v DCH

Hnh 2.6 Cu trc knh HSDPA v HSUPA

Hnh 2.7 Chia s ti nguyn cng sut gia DCH v E-DCH

Hnh 2.8 Minh ha chia s ti nguyn gia cc knh E_DCH v DCH

Hnh 2.9 Ap dng 2ms TTI v 10 ms TTI cho mt

Hnh 2.10 nh thi x l HSUPA khi TTI = 10ms

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Hnh 2.11 nh thi x l HSUPA khi TTI = 2ms

Hnh 2.12 Hot ng HARQ trong chuyn giao mm

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CHNG I

L TRNH PHT TRIN THNG TIN DI NG T 3G LN 4G

1.1. Kin trc chung ca mng thng tin di ng 3G

Mng thng tin di ng (TTD) 3G lc u s l mng kt hp gia ccvng chuyn mch gi (PS) v chuyn mch knh (CS) truyn s liu gi vting. Cc trung tm chuyn mch gi s l cc chuyn mch s dngcng ngh ATM. Trn ng pht trin n mng ton IP, chuyn mchknh s dn c thay th bng chuyn mch gi. Cc dch v k c s liuln thi gian thc (nh ting v video) cui cng s c truyn trn cngmt mi trng IP bng cc chuyn mch gi. Hnh 1.1 di y cho thyth d v mt kin trc tng qut ca TTD 3G kt hp c CS v PS

Hnh 1.1 Kin trc tng qut ca mt mng di ng kt hp c CS v PS

RAN: Radio Access Network: mng truy nhp v tuynBTS: Base Transceiver Station: trm thu pht gcBSC: Base Station Controller: b iu khin trm gc

RNC: Rado Network Controller: b iu khin trm gc

CS: Circuit Switch: chuyn mch knh

PS: Packet Switch: chuyn mch giSMS: Short Message Servive: dch v nhn tinServer: my chPSTN: Public Switched Telephone Network: mng in thoi chuyn mchcng cngPLMN: Public Land Mobile Network: mang di ng cng cng mt t

Cc min chuyn mch knh (CS) v chuyn mch gi (PS) c th hin bng

mt nhm cc n v chc nng lgic: trong thc hin thc t cc min chc nngny c t vo cc thit b v cc nt vt l. Chng hn c th thc hin chc

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nng chuyn mch knh CS (MSC/GMSC) v chc nng chuyn mch gi(SGSN/GGSN) trong mt nt duy nht c mt h thng tch hp cho

php chuyn mch v truyn dn cc kiu phng tin khc nhau: t lu lngting n lu lng s liu dung lng ln.

3G UMTS (Universal Mobile Telecommunications System): H thng thngtin di ng ton cu) c th s dng hai kiu RAN. Kiu th nht s dng cngngh a truy nhp WCDMA (Wide Band Code Devision Multiple Acces: a truynhp phn chia theo m bng rng) c gi l UTRAN (UMTS TerrestrialRadio Network: mng truy nhp v tuyn mt t ca UMTS). Kiu th hai sdng cng ngh a truy nhp TDMA c gi l GERAN (GSM EDGE RadioAccess Network: mng truy nhp v tuyn da trn cng ngh EDGE ca GSM).Ti liu ch xt cp n cng ngh duy nht trong UMTS c gi l 3GWCDMA UMTS.

1.2. Cc hn ch ca 3G

Mng 3G to ra bc tin trin ln trong s pht trin ca h thng thng tindi ng c nhn.Thc t 3G c kh nng h tr hng lot cc dch v internet ding vi cht lng dch v ci thin ng k.Giao din v tuyn WCDMA cthit k h tr vng ci thin vi dung lng cao ci thin ng k hiu sut ch truyn dn mch gi.Tuy nhin 3G c nhng hn ch:Vic t c tc truyn s liu cao l rt kh i vi cng ngh CDMA do cannhiu gia cc dch v.

Kh c th to ra mt di y cc dch v a tc vi yu cu v hiunng v QOS khc nhau do nhng hn ch i vi mng li gy ra bi tiu chun

giao din v tuyn.Ngoi ra,di tn dnh cho h thng 3G s sm b bo ha v c nhng rng

buc khi kt hp ch song cng phn chia theo tn s v thi gian.

1.3. L trnh pht trin thng tin di ng ln 4G

L trnh pht trin cc cng ngh thng tin di ng ln 4G c cho trn hnh1.3 v l trnh nghin cu pht trin trong 3GPP c cho trn hnh 1.2.

Hnh 1.2 Lch trnh nghin cu pht trin trong 3GPP

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Hnh 1.3 L trnh pht trin t 3G ln 4G

AMPS: Advanced Mobile Phone System

TACS: Total Access Communication System

GSM: Global System for Mobile Telecommucations

WCDMA: Wideband Code Division Multiple Access

EVDO: Evolution Data Only

IMT: International Mobile Telecommnications

IEEE: Institute of Electrical and Electtronics Engineers

WiFi: Wireless Fidelitity

WiMAX: Worldwide Interoperability for Microwave Access

LTE: Long Term Evolution

UMB: Untra Mobile Broadband

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CHNG II

TRUY NHP GI NG LN TC CAO (HSUPA)

2.1. Mt s im khc bit ch yu gia HSUPA v HSDPA :

HSUPA tuy dng cng ngh ging HSDPA nhng cng c mt s khc bitcn bn so vi HSDPA, m cc khc bit ny nh hng n vic thc hin tnh

nng :

Bng 2.1 Bng so snh HSDPA v HSUPA

HSDPA HSUPATrn ng xung th cc ti nguynchia s (cng sut, m) u c t

ti mt nt trung tm (nt B).

Vi HSUPA, ti nguyn chia s l ilng nhiu ng ln cho php.

B lp biu v cc b m phi ct trong cng mt nt

B lp biu c t trn nt B, cn bm c phn tn trong cc UE

Cc knh c pht trc giao Cc knh ng ln khng trc giaonn xy ra nhiu gia cc ng truyndn trong cng mt

iu bin bc cao hn iu bin bc thp hn

S dng HARQ khng ng b thchng HARQ ng b khng thch ng cs dngHSDPA ch c mt im kt cui giaothc HARQ- UE

Trong HSUPA, UE thu ACK/NAK tcc tt c cc nt B tham gia vochuyn giao mm

HSDPA s dng ch th s liu mimt bit

Mt s trnh t pht li hai bit (RSN :Retransmission Sequence Number)c s dng cho HSUPA

2.2. Lp biu cho HSUPA :

Chc nng:

i vi HSUPA, b lp biu l phn t quyt nh iu khin vic khi no

v ti tc s liu no mt UE c php pht v phi m bo tng tp m

trong gii hn cho php, R rng tc u cui cng cao th cng sut thu c

ti nt B cng cng cao m bo t s Eb/N0 cn thit cho gii iu bin. Tuy

nhin do ng ln khng trc giao, nn cng sut thu t UE s gy nhiu i vi

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cc u cui khc. V th ti nguyn chia s i vi HSUPA l i lng cng sut

nhiu cho php trong . Nu nhiu qu cao mt s truyn dn trong , cc knh

iu khin v cc truyn dn ng ln khng c lp biu c th b thu sai.

Nhng nu mc nhiu qu thp cho thy rng cc UE b iu chnh thi qu

khng khai thc ht dung lng h thng. V th HSUPA s dng b lp biu cho php ngi s dng c s liu cn pht c php s dng tc s liu cao

ti mc c th m khng vt mc cho php trong .

Khng nh HSDPA, b lp biu v cc b m pht u c t ti nt B,

trong HSUPA b lp biu vn t trong nt B iu khin hot ng pht ca

UE, nhng thng tin trng thi b m li phn tn trong cc nt UE. V th cn

phi c t bo hiu mang thng tin trng thi b m v cng sut pht kh dng

t UE n nt B.

C s cho chng trnh khung lp biu l cc cho php c pht i t nt B

n cc UE cng cc gii hn tc s liu E-DCH v cc yu cu lp biu c

pht i t UE n nt B yu cu cho php pht (ti tc cao hn tc cho

php). Cc quyt nh lp biu c a ra bi phc v, ny chu trch nhim

chnh cho lp biu nh ch ra trn hnh 2.1

Hnh 2.1 - Chng trnh khung lp biu ca HSUPA

Nhiu gia cc cng cn c iu khin, thm ch nu b lp biu cho

php UE pht ti tc s liu cao trn c s mc nhiu trong chp thun c,

nhng vn c th gy nhiu khng th chp nhn c i vi cc ln cn. V

th trong chuyn giao mm, phc v chu trch nhim chnh cho hot ng lp

biu, nhng UE gim st thng tin lp biu t tt c cc m UE nm trong

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pht gi B, nt B th 2 i pht li gi A nhng do cc iu kin knh ti thi

im ny, nt B th hai thm ch khng pht hin c mt pht mi.

Hnh 2.2 Cc pht li trong chuyn giao mm

2.4. Kin trc mng c lp cu hnh E-DCH (v HS-DSCH) : c hiu qu, b lp biu phi c kh nng khai thc cc thay i nhanh

theo mc nhiu v cc iu kin ng truyn. HARQ vi kt hp mm cng cho

li t cc pht li nhanh v iu ny gim chi ph cho cc pht li. V th hai chc

nng ny phi c t gn giao din v tuyn. Do , cng ging nh HSDPA

chc nng lp biu v HARQ ca HSUPA phi t ti nt B. Ngoi ra cng ging

nh HSDPA cng cn gi nguyn cc lp cao hn lp MAC, ngha l m mt iu

khin cho php vn t di quyn iu khin ca RNC. iu ny cho php a

HSUPA d dng vo cc vng c chn la, trong cc khng h tr truyn

dn E-DCH c th s dng chuyn mch knh sp xp lung s ca ngi s

dng ln DCH.

Cng nh HSDPA, mt thc th MAC mi (MAC-e) c a vo UE v

nt B. Trong nt B, MAC-e chu trch nhim truyn ti cc pht li HARQ v lp

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biu, cn trong UE, chu trch nhim chn la tc s liu trong cc gii hn do

b lp biu trong MAC-e ca nt B t ra.

Khi UE nm trong chuyn giao mm vi nhiu nt B, cc khi truyn ti

khc nhau c th c gii m c th c gii m ng ti cc nt B khc nhau.

Kt qu l mt khi truyn ti c th thu ng ti mt nt B, trong khi mt ntB khc vn tham gia v pht li ca mt khi truyn ti c pht sm hn. V th

m bo chuyn cc khi truyn ti ng trnh t n giao thc RLC, cn c

chc nng sp xp li th t trong RNC dng mt thc th mi MAC-e. Trong

chuyn giao mm, nhiu thc th MAC-e c s dng cho mt UE s liu c

thu t nhiu . Tuy nhin MAC-e trong phc v chu trch nhim chnh cho lp

biu, MAC-e trong khng phc v ch yu x l giao thc HARQ nh hnh 2.3.

Hnh 2.3 Kin trc mng c lp cu hnh E-DCH (v HS-DSCH)

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2.5. KNH RING TNG CNG (E-DCH) TRONG HSUPA :

2.5.1. E-DCH v cc knh bo hiu :

h tr lp biu v HARQ vi kt hp mm trong WCDMA, mt kiu

knh mi, E-DCH c a vo trong pht hnh R6. E-DCH c lp cuhnh ng thi vi mt hay nhiu knh DCH (Dedicated Channel) khc. Nh vy,

truyn dn s liu gi tc cao trn knh E-DCH c th xy ra ng thi vi cc

dich v s dng DCH t cng mt UE. Cc knh truyn ti E-DCH h tr lp biu

nhanh da trn nt B, HARQ nhanh vi tng phn d v tu chn TTI ngn hn

(2ms). Tuy nhin khc vi HSDPA, E-DCH ca HSUPA khng phi l knh chia

s m l knh ring v cu trc th n rt ging R3 DCH hn, nhng khc vi

DCH, E-DCH c lp biu nhanh v HARQ.

Hnh 2.4 Cc knh cn thit cho mt UE c kh nng HSUPA

Di y ta tng kt cc knh ca HSUPA:1. E-DPCH bao gm hai knh truyn ng thi: E-DPDCH v DPCCH. E-DPDCH c h s tri ph kh bin t 2 n 256 vi cu hnh cc i2xSF2+2SF4 (tc s liu nh bng 5,76 Mbps vi t l m ha 1/1). Khongthi gian truyn dn (TTI) ca E-DPDCH c th l 2ms (tc s liu ln hn2Mbps) hoc 10ms (tc s liu bng hoc di 2Mbps). DPCCH truynng thi vi E-DPDCH cha cc thng tin hoa tiu v iu khin cng sut(TPC).2. E-DPCCH l knh vt l mi ng ln tn ti song song vi E-DPDCH

truyn thng tin ngoi bng lin quan n truyn dn E-DPDCH. E-DPCCH ch s tri ph 256 cha cc thng tin sau:

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- E-TFCI (Enhanced-Transport Format Combination Indicator: ch thkt hp khun dng truyn ti) thng bo cho my thu nt B vkch thc khi truyn ti c mang trn cc E-DPDCH. T thng tinny my thu rt ra s knh E-DPDCH v h s tri ph c s dng

- S th t pht li (RSN: Retransmission Sequence Number) thng bo v

s th t ca khi truyn ti hin thi c pht trong chui HARQ.- Bit hnh phc thng bo rng UE c hi lng vi tc hin thi (cngsut tng i n nh cho n) hay khng v n c th s dng c nnh cng sut cao hn hay khng.

3. HICH (HARQ Indicator Channel: knh ch th HARQ) l knh vt lng xung truyn ACK hoc NAK cho HARQ.4. E-RGCH (E-DCH Relative Grant Channel: knh cho php tng i E-DCH) l knh vt l ng xung mi pht lnh tng/gim mt nccng sut ca lp biu (thng ch 1dB) so vi gi tr tuyt i c n nh

bi knh E-AGCH. E- RGCH c s dng cho cc iu chnh nh trong khiang xy ra truyn s liu. 20E-RGCH c ghp chung vi 20HICH trn cs 40 ch k vo mt DPDCH c m nh knh vi h s tri ph 125. E-AGCH (E-DCH Absolute Grant Channel: knh cho php tuyt i) l knhvt l ng xung mi c m nh knh vi h s tri ph 128 ch th mccng sut chnh xc ca E-DPDCH so vi DPCCH. E-AGCH cha:

- Gi tr cho php tuyt i ch th t s cng sut E-DPDCH/DPCCH m UEc th s dng

- Phm vi cho php tuyt i cho php hoc cm UE pht theo HARQ

- S nhn dng UE s/th cp cho php UE xc nh knh E-AGCH ny cdnh cho n hay khng

Bng 2.5 l tng hp cc kh nng p dng cc tnh nng ca DCH, HSDPA vHSUPA.

Bng 2.5 Bng so snh HSDPA, HSUPA v DCH

Tnh nng DCHHSDPA

(HSDSCH)

HSUPA(E-DCH)

H s tri ph kh bin C Khng Ciu khin cng sutnhanh

C Khng C

iu bin thch ng Khng C KhngLp biu da trn nt B Khng C CHARQ lp 1 nhanh Khng C C

Tnh nng DCHHSDPA

(HSDSCH

)

HSUPA(E-DCH)

Chuyn mm giao mm C Khng C

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di TTI (ms) 80,40,20,10 2 10,2

Nh vy, khng nh HSDPA, HSUPA khng h tr iu bin thch ng (xem

bng 2.5) v n khng h tr cc s iu bin bc cao. Do cc s iu bin

bc cao phc tp hn v i hi pht nhiu hn nng lng trn mt bit, v th n gin ng ln s dng s BPSK kt hp vi truyn dn nhiu m nh

knh song song.

c tnh then cht ca HSUPA h tr s liu gi hiu qu l tr thp, v

th HSUPA h tr TTI ngn 2ms, m bo thch ng nhanh cc thng s truyn

dn v gim cc tr ngi dng u cui lin quan n truyn dn gi. iu ny

khng ch gim chi ph pht li m cn gim thi gian pht ln u. Tr x l lp

vt l thng t l vi khi lng s liu cn x l v TTI cng ngn th khi

lng s liu cn x l trong tng TTI cng nh i vi mt tc s liu cao cho

trc. Tuy nhin khi trin khai vi cc tc s liu va phi (trong ln chng

hn) c th cn c TTI di hn v TTI 2ms tr nn qu ngn khng cn thit v s

dn n chi ph cho thng tin b sung qu ln.

V th E-DCH h tr hai TTI, 2ms v10ms mng lp cu hnh tu chn

hp l hn. V nguyn tc,cc UE khc nhau c th c lp cu hnh vi cc TTIkhc nhau. E-DCH c sp xp ln mt tp cc m nh knh ng ln v c

gi l cc knh s liu vt l ring ca E-DCH (E-DPCH: Enhanced Dedicated

Physical Data Channel). Ph thuc vo s liu tc thi, s cc E-DPCH v cc h

s tri ph c th thay i.

Nh phn tch, E-DCH v DCH c th c pht ng thi. tng

thch ngc i hi nt B khng h tr HSUPA ng ln khng th nhn thy E-

DCH. iu ny c gii quyt bng cch tch ring x l DCH, E-DCH v sp

xp cc tp m nh knh khc nhau nh trn hnh 2.5.

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Hnh 2.5 Sp xp tch ring x l E DCH v DCH

Nu UE nm trong chuyn giao mm vi nhiu , th cc khng h tr E-

DCH khng th nhn thy n. iu ny cho php nng cp dn mng hin c. Mt

ch li na ca cu trc ny l n n gin ha v a ra TTI 2ms v cng cho

php t do hn vic la chn x l HARQ.

Bo hiu iu khin ng xung cn cho hot ng ca E-DCH. Cc knh

iu khin ng xung ny cng nh ng ln cn thit cho hot ng ca E-

DCH, c minh ha trn hnh 2.6 cng vi knh s dng cho HSDPA.

Hnh 2.6 Cu trc knh tng th HSDPA v HSUPA

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Trong c ch HARQ, nt B phi c kh nng yu cu UE pht li. Thng tin

ny (ACK/NAK) c pht trn knh vt l ring ng xung E-HICH (E-

DCH : Hybrid ARQ Indicator Channel: knh ch th HARQ ca E-DCH). Mi UE

c lp cu hnh E-DCH s thu E-HICH ca mnh t tng tham gia vo chuyn

giao mm vi n.Cc cho php lp biu (c pht i t b lp biu n UE iu khin cho

php khi no v ti tc no UE c pht) c th c pht n UE trn knh

cho php tuyt i ca E-DCH chia s, E-AGCH. E-AGCH ch c pht t

phc v v y l chu trch nhim chnh cho hot ng lp biu v ch cc UE

c lp cu hnh E-DCH l c th thu c. Ngoi ra, thng tin cho php lp

biu cng c th c truyn dn n UE thng qua knh cho php tng i ca

E-DCH, E-RGCH. E-RGCH c s dng cho cc iu chnh nh trong khi ang

xy ra truyn s liu.

Trn ng ln, cn c bo hiu iu khin cung cp cho nt B thng tin

cn thit cho gii iu bin v gii m truyn dn s liu. V v nguyn l, phc

v trong chuyn giao mm c thng tin ny v n c pht i cc cho

php lp biu, nhng cc khng phc v trong chuyn giao mm khng c thng

tin ny. Ngoi ra , E-DCH cng h tr cc truyn dn khng c lp biu. V thc bo hiu iu khin ngoi bng trn ng ln v knh E-DPCCH (E-DCH

Dedicated Physical Control Channel) c s dng cho mc ch ny.

R rng, quan h gia DCH v E-DCH trong truyn dn ng thi t mt UE

rt n gin. Trc tin chn kt hp khun dng truyn ti TFC (Transport

Format Combination) c thc hin cho DCH v cng sut c s dng cho

qu trnh ny tt nhin khng cn kh dng cho qu trnh chn E-TFC (Enhanced

TFC). iu ny c ngha l DCH c quyn tuyt i trc tin i vi ti nguyn

cng sut, hay ni mt cch khc DCH c u tin tuyt i so vi E-DCH. V E-

DCH c thit k cho truy nhp gi ng ln v v th nu c bt k dch v

chuyn mch knh no th dch v ny phi c sp xp ln DCH. Do cc dch

v chuyn mch knh chu ng rt km i vi cc thay i tc s liu thng

xuyn v t bin, v th c th ni rng cuc thoi tc thch ng AMR

(Adaptive Multi Rate) thng thng s nhn cng sut m n cn v pht cng

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sut ny ln DCH v ch cng sut cn li l c s dng cho E-DCH. n nh

cng sut ca qu trnh TFC v E-TFC ca UE c ch ra trn hnh 2.7 Cn lu

, tc DCH cho php cc i khi c lp cu hnh song song vi E-DCH l

64kbps.

Hnh 2.7 Chia s ti nguyn cng sut gia DCH v E-DCH

2.5.2. iu khin cng sut trong E-DCH :

iu khin cng sut lm vic tng t nh vi DCH v vic a vo E-

DCH khng lm thay i kin trc iu khin cng sut tng th. iu khin cng

sut vng trong iu chnh cng sut pht ca DPCCH. Cng sut pht E-DPDCH

c thit lp bi E-TFC tng i so vi DPCCH theo cch tng ng nh

vic thit lp cng sut pht DPDCH bi chn la TFC. iu khin cng sut

vng ngoi c t trong nt B a ra quyt nh da vo S/R ch c thit lp

bi iu khin cng sut vng ngoi t ti RNC.

Vng ngoi trong cc pht hnh u tin ch yu c iu khin bi DCH

BLER (t l li khi) ti RNC. Nu DCH c thit lp cu hnh, vng ngoi(thc hin theo gii thut c th ) c th ch tc ng ln DCH. Gii php ny

hot ng tt chng no c cc ln pht trn knh DCH, nhng hiu nng gim

nu s ln pht DCH tha hn.

Nu khng c DCH no c lp cu hnh, v nu s ln pht xy ra trn

DCH tha, cn xt n thng tin v cc ln pht E-DCH. Tuy nhin vic a ra

HARQ cho E-DCH, E-DCH BLER c th khng thch hp l u vo cho iu

khin cng sut vng ngoi . Trong phn ln cc trng hp, E-DCH BLER ti

Page23

Chn

E-T

FCc

ths

dng

cngsu

tc

n

lisau

khic

hn

TFC

,bg

iihn

bicngsu

t

khdngv

cngsu

tc

c

i

c

lp

biu

Chn

TFC

n

n

h

ton

b

cngsu

t

cn

thit

p

h

t

DPDCHti

tc

s

liu

c

chn

Cng sut kh dngcho truyn dn E-

Cng sutkh dng cho

EDPCCH/E-DPDCH

Cng sut

DPCCH + DPDCH

Cng sut pht UE cc

BlpbiuntBiukhincngsuttngiccimlachnE-TFCcthsdng

Cng sut pht UE

Cng sut phtDPDCCH c tnh


24/30

RNC gn bng 0 dn n vic vng ngoi h thp S/R ch v dn n mt

DPCCH ng ln nu ch s dng E-DCH lm u vo cho c ch vng ngoi.

V th h tr iu khin cng sut vng ngoi , s ln pht li thc t c s

dng pht mt khi truyn ti c nt B thng bo cho RNC. RNC c th s

dng thng tin ny nh l mt b phn ca vng ngoi thit lp S/R ch chovng trong.

2.5.3. iu khin ti nguyn cho E-DCH :

Ging nh HSDPA, mt b phn qun l ti nguyn cho HSUPA c x l

bi nt B ch khng phi ti RNC. Tuy nhin RNC vn chu trch nhim tng th

cho qun l ti nguyn bao gm iu khin cho php v x l nhiu gia cc . V

th cn phi gim st v iu khin mc s dng ti nguyn ca cc knh E-DCH t c s cn i tt gia cc ngi s dng E-DCH v khng s dng

E-DCH, nh m t trn hnh 2.8.

Hnh 2.8 Minh ha chia s ti nguyn gia cc knh E-DCH v DCH

iu khin cho php, RNC s dng tng cng sut thu bng rng (RTWP:

Received Total Wideband Power), RTWP ch th tng mc s dng ti nguyn

trong . iu khin cho php cng c th s dng tc bit c E-DCH cungcp. Cng vi vic o RTWP c th thit k gii thut cho php nh gi

khong cn trng ca b lp biu cho mt loi u tin c th.

iu khin ti trong , RNC c th thng bo RTWP ch cho nt B trong

trng hp nt B phi lp biu cc cuc truyn dn E-DCH duy tr RTWP

trong gii hn ny. RNC cng c th khng thng bo RTWP tham kho nt B

c th ci thin c tnh ti ng ln trong . Lu rng chun khng quy nh

vic b lp biu phi s dng kt qu o tuyt i (RTWP) hay tng i (tng tp

Page24

Cc ngi s dng

E-DCH ni

Cc ngi s dngDCH ni

Nhiu gia cc

Tp m nhit

B lp

RTWPo

Tp m nnc c tnh

Nt B

Khdngcho E-

DCH

RNC RTWPch

Tpm

Khng s dng

RTWPbo co

iu khincho phpiu khin

RTWPchRTWPthamkho


25/30

m, c xc nh bng t s gia tng cng sut thu chia cho cng sut tp m:

PRX/PN). Bn thn nt B thc hin mi php o cn thit cho mt thit k b lp

biu c th.

RNC c th iu khin t s nhiu gia cc v nhiu ni , RNC c th

thng bo cho nt B v t s gia cng sut khng phc v E-DCH v tng cngsut E-DCH. B lp biu phi tun th gii hn ny khi thit lp ch th qu ti v

khng c php chn cc UE khng phc v E-DCH nu gii hn ny khng b

vt qu. Gii php ny nhm phng nga vic mt lm tn hi n cc UE

trong cc ln cn. Nu khng s dng gii php ny, b lp biu v nguyn tc

c th thng xuyn thit lp ch th qu ti nh cp ti nguyn t cc ln

cn, y l iu khng th chp nhn.

2.6. Khong thi gian truyn TTI.

Trong khi HSDPA ch h tr cho TTI 2 ms th HSUPA c th h tr cho hai

TTI (2ms v 10ms). TTI 2ms c h tr gim tr cn TTI 10 ms c h tr

m bo ti bin .

i vi tc s liu thp hn 2 Mbps dung lng khng ph thuc vo TTI.

Tuy nhin khi tc s liu cao hn 2 Mbps, kch thc khi s dng di10ms qu ln v v th c th m bo cc tc s liu cao hn 2 Mbps bng

cch s dng TTI 2ms. i vi cc v m, cc tc bit trn ng ln cng b

gii hn do hn ch cng sut pht. iu ny c ngha l TTI 10ms s l gi tr

ban u khi mi trin khai h thng, iu ny cng c th hin cc kh nng

ca UE (2ms TTI l ty chn cho hu ht cc loi UE).

Nu khng xy ra qu nhiu pht li th vic s dng 2ms TTI l c rt c li

v tr gia cc pht li s ngn hn so vi 10ms. Tuy nhin s gp phi vn khi

tin n gn bin , khi ny bo hiu s dng chu k 2ms bt u tiu th nhiu

cng sut c bit ti nt B nh minh ha trn 2.9.

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Hnh 2.9- p dng 2 ms TTI v 10 ms TTI trong mt

Khc vi HSDPA, s ngi s dng tch cc c th ng thi ln hn nhiu

v th c th m bo bo hiu ng xung cho s lng ln ngi s dng vi

vic s dng chu k 2ms l khng th.

2.7. TH TC HOT NG LP VT L:

2.7.1. Th tc hot ng lp vt l cho giao thc HARQ :

Hnh 2.10 v 2.11 cho thy th tc :

Hnh 2.10 - nh thi x l HSUPA khi TTI = 10ms

Page26

ng xung

ng ln

14-16 ms 5,5-7,5 ms

Kt quCRC E-DPCCH

E-DCH

E-DCH

30 ms (3TTI)

Pht li ln thnht (nu NAK)

E-HICH

8 ms ACK/NAK

E-DPCCH

E-DCH

ACK/NAKKt quCRC

ng xung

ng ln

E-HICH

2 ms

3,5-5,5 ms 6,1-8,1 ms

Pht li ln th nht(nu NAK)2 ms 14 ms (7 TTI)


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trong tp tch cc u lin quan. Hot ng HARQ c thc hin bng cch s

dng quy tc ging nh quy tc iu khin cng sut ng ln. Nu mt nt B

ca tp tch cc pht ACK th thng tin m lp MAC nhn c l thu c

ACK v lp MAC s coi rng truyn dn thnh cng v chuyn sang gi sau.

Nguyn l hot ng ca HARQ trong chuyn giao mm c minh ho trn hnh2.12. V cc nt B x l qu trnh ny c lp nn th t gi khng c m bo

v th t ny phi c iu chnh ti RNC. y l l do chnh m kin trc giao

thc c thm thc th MAC-hs.

i vi NAK t cc khng phc v, gi tr truyn dn l chui s 0 v v

th thc cht NAK ch c truyn dn t phc v. Nu phc v trong chuyn

giao mm hn vi cc khc c nh ngha l thuc cng mt tp ng truyn

v tuyn, th cc NAK c pht t tt c cc ny c th kt hp mm trong

my thu ging nh kt hp cc lnh iu khin cng sut trong chuyn giao mm

hn.

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KT LUNHSUPA c xem l cng ngh 3,75G hay cn gi l 4G. y l cng ngh

chim u th tc uplink: t 1,4Mbps n 5,76Mbps. HSUPA s dng knh

truyn nng cao tc ng ln E-DCH (Enhanced Dedicated Channel).Mc

tiu ch yu ca HSUPA l ci tin tc ti ln cho cc thit b di ng v gim

thi gian tr trong ng dng game, email, chat... HSUPA l cng ngh pht trin

sau HSDPA nhm tha mn nhu cu tng tc thi gian thc vi cc ng dng i

hi tc v tin cy cao.

TAI LIU THAM KHO

1. TS.Nguyn Phm Anh Dng, Gio trnh thng tin di ng th h th

ba, Hc Vin Cng Ngh Bu Chnh Vin Thng, Nh xut bn Bu in, 2004.

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2. TS.Nguyn Phm Anh Dng, WiMax, Hc vin Cng ngh Bu

chnh Vin Thng, 2008.

3. TS.Nguyn Phm Anh Dng, L trnh pht trin thng tin di ng3G ln 4G, Hc vin Cng Ngh Bu Chnh Vin Thng, 2008.

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