Nghiên cứu 1 số giải pháp nâng cao chất lượng mạng 3G

B GIO DC V O TO TP ON BU CHNH VIN THNG VIT NAM

HC VIN CNG NGH BU CHNH VIN THNG ---------------------------------------

NH R

NGHIN CU MT S GII PHP NNG CAO

CHT LNG MNG THNG TIN DI NG 3G TI VIT NAM GIAI ON 2010 - 2015

CHUYN NGNH : K THUT IN T M S : 60.52.70

TM TT LUN VN THC S K THUT

H NI, NM 2011

M U

n thng 10/2010, trn c nc c 04 doanh nghip trin khai cung

cp dch v vin thng th h th 3 (3G), bao gm: Vinaphone, Mobifone,

Viettel, EVNTelecom, trong EVNTelecom l doanh nghip ang trin khai

dch v. Trn thc t, cc doanh nghip ln nh Vinaphone, Mobifone, Viettel

trin khai HSPA trn h thng vin thng ca mnh. Theo bo co ca B

Thng tin v Truyn thng, cc doanh nghip lp t tng s khong 47.800

trm gc (Node B) trn a bn 63 tnh/thnh ph trc thuc Trung ng, tng

s c khong 11 triu thu bao ng k chnh thc s dng dch v 3G. Ngoi

ra, cn c s xen ln s dng cc dch v 3G ca cc thu bao 2G. C v kha

cnh cng ngh v kinh doanh u khng c s phn bit r rng gia ngi s

dng 2G hay 3G. Tuy nhin, mc d s lng khch hng cn rt hn ch, dch

v c s dng ch yu l truy cp Internet nhng trong giai on va qua

xut hin nhiu kin t pha ngi s dng phn nh v cht lng mng 3G

v c 2G k t khi trin cung cp dch v.

Trong khong thi gian cui nm 2009, khi dch v 3G bt u c

trin khai, phn ln cc kin phn nh v vic thit b u cui ca ngi

s dng dch v lc chuyn sang mng 3G, lc chuyn sang mng 2G nhng

ngay c cc dch v truyn thng nh thoi, nhn tin cng b gim st cht

lng. Trong khong thi gian gn y, sau khi s dng th nghim dch v

mng 3G, nhiu ngi s dng dch v phn nh v tc truy nhp

Internet, cht lng hnh nh dch v truyn hnh di ng. Nhiu nhn nh

trn cc din n tin hc cho rng, cht lng ca mng 3G Vit Nam rt

thp, thm ch tc ng truyn dn ca mng 3G cha t tc tiu

chun thp nht theo khuyn ngh ca ITUT v theo l thuyt cng ngh.

iu t ra mt vn ln cho doanh nghip thng tin di ng,

nh qun l trong vic trin khai h tng mng v cung cp dch v. K t

khi chnh thc c cp giy php trin khai mng, dch v 3G, c quan

qun l chuyn ngnh v cht lng dch v vin thng, cc doanh nghip

trin khai nhiu gii php k thut, nghip v nng cao cht lng

mng v dch v. V c bn, dch v ang tng bc i vo n nh, p

ng yu cu ca ngi s dng. Tuy nhin, vic nghin cu, xut nhng

gii php nng cao hn na cht lng dch v, p ng nhu cu s dng

dch v khng ch hm nay m cn c th d bo s pht trin ca dch v

trong tng lai c nhng gii php mang tnh h thng, hon thin ngay

t hm nay l iu rt cn thit. y l nguyn nhn chnh tc gi la

chn lun vn ny.

Lun vn nhm kho st, nghin cu hin trng trin khai xy dng

mng 3G, vic cung cp dch v ca cc doanh nghip thng tin di ng

Vit Nam. Nghin cu v kho st cht lng mng, dch v m doanh

nghip ang cung cp ra th trng, cc ch tiu cht lng dch v m

doanh nghip ng k, cng b. Trn c s nhn xt, tm ra cc nguyn

nhn nh hng n cht lng dch v mng 3G. ng thi, d bo v s

pht trin dch v trong thi gian ti v xut mt s gii php nng cao

cht lng dch v.

i tng v phm vi nghin cu: Lun vn nhm nghin cu mng

3G ca cc doanh nghip thng tin di ng Vit Nam trin khai trong thi

gian qua, bao gm 03 doanh nghip ch yu gm: Vinaphone, Mobifone,

Viettel. Thi gian xem xt s liu trong khong thi gian 01 nm k t khi

doanh nghip trin khai mng, dch v.

Thi gian nghin cu, ng dng: Giai on t 2011 2015.

Phng php nghin cu: Lun vn c nghin cu bng cc

phng php tng hp, phn tch, nh gi hin trng cu hnh mng 3G m

cc doanh nghip trin khai; cc kt qu o kim mng 3G m cc c quan

qun l, cc doanh nghip o kim trong thi gian qua; xu hng pht

trin dch v trong thi gian ti. Trn c s xy dng hng pht trin

tip theo ca lun vn.

Chng 1

TNG QUAN V H THNG THNG TIN DI NG

TH H TH BA

Chng 1 tp trung gii thiu tng quan v qu trnh pht trin t

thng tin di ng th h th hai ln thng tin di ng th h th ba.

Khi qut v h thng thng tin di ng th ba, bao gm kin trc

tng quan, cng ngh v yu cu, tiu ch i vi h thng thng tin di

ng th h th ba.

1.1. Khi qut v mng thng tin di ng th h th ba - 3G

1.1.1. Qu trnh pht trin cc th h thng tin di ng

Thng k qu trnh hnh thnh, pht trin cc h thng thng tin di

ng t h thng 1G n h thng 3G. Cc t chc nghin cu, pht trin

tiu chun xy dng cc h thng thng tin di ng.

1.1.2. Cc tiu ch chung xy dng IMT 2000

Mc tm tt kt qu nghin cu v cc tiu ch chung ca H thng Thng tin Di

ng Ton cu cho nm 2000, bao gm cc tiu ch nh: Bng tn s s

dng; yu cu k thut v tc ng truyn, cht lng, s ph hp vi

kin trc ca cc mng thng tin di ng trn th gii; cc dch v m h

thng c th h tr.

1.1.3. M hnh kin trc ca h thng thng tin di ng th h ba

1.1.3.1. Kin trc chung mng thng tin di ng 3G

Gii thiu v kin trc chung mng thng tin di ng 3G

Hnh 1.2. Kin trc tng qut ca mt mng di ng kt hp c CS v PS

1.1.3.2. Kin trc tham kho mng W-CDMA

Gii thiu 03 kin trc tham kho mng thng tin di ng W-CDMA,

bao gm:

- Kin trc mng c s W-CDMA trong 3GPP Release 1999;

- Kin trc mng W-CDMA pht hnh 4;

- Kin trc mng a phng tin IP ca GPP.

Hnh 1.3. Kin trc tham chiu c bn ca 3GPP R99

(Tham kho ngun http://www.3gpp.org)

Hnh 1.4. Kin trc mng W-CDMA pht hnh 4

(ngun: Bi ging Gii thiu cng ngh 3G WCDMA UMTS cho cn b,

nhn vin Tng Cng ty Vin thng Qun i TS Nguyn Phm Anh Dng)

Hnh 1.5. Kin trc mng a phng tin IP ca GPP

(Tham kho ngun http://www.3gpp.org)

1.1.4. Cc loi thit b u cui cho 3G

1.1.5. Xu hng pht trin th h thng tin di ng sau 3G

Hnh 1.6. L trnh pht trin cc cng ngh thng tin di ng ln 4G

(ngun: Bi ging Gii thiu cng ngh 3G WCDMA UMTS cho cn b,

nhn vin Tng Cng ty Vin thng Qun i TS Nguyn Phm Anh Dng,

c b sung)

1.2. Khi qut v thng tin di ng th h th ba Vit Nam

1.2.1. Vic trin khai h tng mng thng tin di ng 3G

1.2.1.1. H tng thng tin di ng Vit Nam trc khi trin khai 3G

Khi qut v h tng thng tin di ng Vit Nam trc khi trin khai

3G ti Vit Nam, bao gm thng tin nh cung cp dch v, v cc mng di

ng, cng ngh ang khai thc, cc dch v ang c cung cp.

1.2.1.2. Cng ngh 3G Vit Nam la chn

Chun 3G m Vit Nam la chn l WCDMA bng tn 2100 MHz.

Cng ngh ny hot ng da trn CDMA v c kh nng h tr cc dch v

a phng tin tc cao nh video, truy cp Internet, hi tho c hnh...

Di tn lm vic 1920 MHz -1980 MHz, 2110 MHz - 2170 MHz.

1.2.1.3. Vic trin khai h tng mng

04/08 doanh nghip c trin khai cung cp dch v thng tin di

ng 3G bao gm: Vinaphone, VMS-Mobifone, Viettel v Lin danh

EVNTelecom v HanoiTelecom. V c bn, bn doanh nghip ni trn u

s dng li 100% h tng k thut mng thng tin di ng th h th hai

trin khai h tng k thut mng th ba.

1.2.2. Phng n pht trin dch v

Hin nay, nm dch v 3G c s dng nhiu nht l:

1) Mobile TV: Truyn hnh trc tuyn trn in thoi di ng

2) Video on demand: Xem phim theo yu cu

3) Video call: m thoi c hnh nh

4) Tele-medicine: Gim st hoc cung cp thng tin y t n cc thu

bao

5) Location - based services: Cung cp thng tin v thi tit, tnh hnh

giao thng, thng tin v cc thu bao hot ng trong cng phm vi

1.3. Kt qu trin khai thc t mng v dch v thng tin th h th ba

Vit Nam

- Viettel: Trin khai c khong 18.300 trm NodeB;

- Vinaphone: Trin khai c khong 10.000 trm NodeB;

- VMS-Mobifone: Trin khai c khong 11.000 trm NodeB;

- Lin danh EVNTelecom-HanoiTelecom trin khai c khong

6.500 trm NodeB.

Bng 1.1. Tng s thu bao 3G doanh nghip vin thng pht trin (tnh

n thng 12/2010)

S TT Tn doanh nghip Tng s thu bao 3G

1 Doanh nghip th nht 6.500.000

2 Doanh nghip th hai 3.500.000

3 Doanh nghip th ba 1.760.000

4 Doanh nghip th t 960

Bng 1.2. Bng tn trin khai 3G m cc doanh nghip vin thng

Vit Nam c cp php

Tn doanh

nghip

Tn s ng xung

(Mhz)

Tn s ng ln (Mhz)

VMS 2110-2125 1920-1935

Viettel 2125-2140 1935-1950

EVN-HTC 2140-2155 1950-1965

VNP 2155-2170 1965-1980

1.4. Kt lun chng

Chng 2

THC TRNG CHT LNG MNG, DCH V THNG TIN DI

NG TH BA VIT NAM

Chng 2 gii thiu v tiu chun cht lng ca h thng thng tin th h

th ba c cc t chc nghin cu khuyn ngh. Cc yu t nh hng n

cht lng mng, dch v. ng thi, chng tng hp, nh gi v cht

lng mng, dch v 3G ca cc doanh nghip trin khai trong thi gian

qua. Trn c s a ra cc nguyn nhn nh hng n cht lng

mng, dch v 3G.

2.1. C s v tiu chun nh gi cht lng dch v 3G

Bng 2.6. Bng tng hp mc tiu xut cho cc ch tiu nh gi

cht lng mng 3G o Driving test

STT n v Mc tiu Ghi ch 1. Coverage Vng ph

1 RSCP dBm

Densurban: 95% s mu c RSCP -88dBm Urban: 95% s mu c RSCP -93dBm Suburban: 95% s mu c RSCP -98dBm Rural: 95% s mu c RSCP -105dBm

2 Ec/No dB 95% s mu c Ec/No -12dB

2. Performance Hiu sut a. Access Truy nhp

3 CSSR (Voice call) % 98% Ch tnh cho Voice Call

4 VCSSR (Video Call) 97.5%

5 PDP Activation Success Rate % 98%

b. Retainbility Kh nng gi cuc gi 6 CDR (Voice Call) % 1% 7 VCDR (Video Call) % 2%

c. Mobility Di ng 8 SHOSR % 98.5%

9 IFHOSR % 98% 10 IRHOSR % 90% 11 LUSR % 99%

d. Data Throughput Thng lng

12 R99 Avg

Throughput DL&UL

kbit/s 300kbit/s

HSPA Avg Throughput DL (o

im) Mbit/s 80% gii hn Min Download

13 HSPA Avg Throughput DL (o

tuyn) Mbit/s 50% gii hn Min DL ca tt c cc cell

HSPA Avg Throughput UL

(o im) Mbit/s 80% gii hn Min Upload

HSPA Avg Throughput UL

(o route) Mbit/s 50% gii hn Min Upload ca tt c cc cell

Ch p dng khi nh gi thi gian u

thit lp mng. S iu chnh li khi

mng a vo hot ng.

. Latency tr

14 AMR Access Delay Time s 3.8s

15 VC Access Delay Time s 5.5s

16 PS Access Delay Time s 2.8s

R99 Ping Delay Time ms 200

17 HSPA Ping Delay Time ms 150

Ch cell cn h tr c

HSDPA v HSUPA

2.2. C s thc tin cht lng mng, dch v 3G

2.2.1. Phn nh ca ngi s dng dch v, ca cc nh khoa hc, ca

c quan qun l, doanh nghip vin thng

C th cc kin sau: Phm vi ph sng hp;kh truy nhp mng 3G

hoc khi truy nhp c th thng b ri ng truyn; tc ng truyn

thp, hnh nh b git, v; s n nh truy nhp gia mng 2G v 3G ti

cng mt thi im. mt s a phng, thu bao mng ny c th truy

nhp vo mng khc nhng khng th s dng c dch v; thit b m cc

doanh nghip trin khai 3G cung cp cho ngi s dng khng m bo cht

lng.

2.2.2. Kt qu o kim thc t mng thng tin th h th ba (Driving

test)

2.2.2.1. Kt qu o 3G ca doanh nghip th nht

(chi tit xem ti Lun vn y )

2.2.2.2. Kt qu o 3G ca doanh nghip th hai


2.2.2.3. Kt qu o 3G ca doanh nghip th ba


2.3. Nhn xt, nh gi v thc trng cht lng mng, dch v

Bng tng hp mc tiu xut cho cc ch tiu nh gi cht lng

mng 3G o Driving test th c 03 mng 3G u c mt s tiu ch cha t

c mc tiu. iu ny th hin bng di y:

Bng 2.10. Bng tng hp kt qu o Driving test 03 mng 3G ca

doanh nghip vin thng Vit Nam i chiu vi tiu chun xut

Tiu ch Mc tiu Doanh nghip 1 Doanh nghip 2 Doanh nghip 3 Coverage Vng ph RSCP Densurban: 95%

s mu c RSCP -88dBm Urban: 95% s mu c RSCP -93dBm Suburban: 95%

Coverage Rate(Total RSCP>=-85dBm t 25.31% Coverage Rate(Total RSCP>=-



s mu c RSCP -98dBm

90dBm t 31.65%

90dBm t 29.88%

90dBm t 31.67%

Ec/No 95% s mu c Ec/No -12dB

56.21% 58.38% 62.34%

Access Truy nhp CSSR (Voice

call) 98% 75.49% 76.50% 76.99%

VCSSR (Video Call)

97.5% 56.05% 52.37% 52.45%

PDP Activation Success Rate

98% 88.56% 89.75% 93.57

Retainbility Kh nng d cuc gi CDR (Voice

Call) 1% 0.45% 0.77%

VCDR (Video Call)

2% 12.64% 11.94%

Mobility Di ng IFHOSR 98% 98.38% 98.27% 98.15% IRHOSR 90% 42.47% 44.00% 48.68%

LUSR 99% 95.48% 97.77% 95.50% Data Throughput Thng lng Avg Throughput

DL&UL 300kbit/s

HSPA Avg Throughput DL

(o im)

80% gii hn Min DL

HSPA Avg Throughput DL

(o tuyn)

50% gii hn Min DL ca tt

c cc cell HSPA Avg

Throughput UL (o im)

80% gii hn Min UL

HSPA Avg 50% gii hn

94.35% mu th chiu xung c tc

Throughput UL (o tuyn)

Min UL ca tt c cc cell

Latency tr AMR Access Delay Time

3.8s 3.27 3.74 3.81

VC Access Delay Time

5.5s 5.87 5.83 5.83

R99 Ping Delay Time

200 ms 690 690 680

HSPA Ping Delay Time

150 ms 540 580 570

T bng trn cho thy, cc ch tiu sau y cha t tiu chun

xut:

1) RSCP: nh gi cng tn hiu;

2) Ec/No: nh gi cht lng tn hiu, l t l cng tn hiu trn

nn nhiu trng;

3) CSSR: nh gi t l thit lp cuc gi thoi thnh cng;

4) PDP Activation Success Rate: nh gi t l truy nhp dch v

thnh cng;

5) CSSR: nh gi t l cuc gi thoi thnh cng

6) VCSSR: nh gi t l thit lp cuc gi hnh nh thnh cng;

7) VCDR: nh gi t l cuc gi hnh nh b ri;

8) IRHOSR: nh gi t l chuyn giao cuc gi thnh cng gia

mng WCDMA v mng GSM ca thu bao trong ch thoi AMR;

9) LUSR: nh gi t l cp nht v tr thnh cng;

10) Throughput DL&UL: nh gi thng lng ng xung v

ng ln;

11) VC Access Delay Time: nh gi thi gian tr thit lp cuc gi

hnh nh;

12) R99 Ping Delay Time: nh gi thi gian tr khi thit lp php o

PING cc dch v thoi, thoi hnh nh, dch v s dng cng ngh chuyn

mch gi (PS);

13) HSPA Ping Delay Time: nh gi thi gian tr khi thit lp php

o PING cc dch v s liu.

2.4. Nguyn nhn nh hng n cht lng mng v dch v 3G Vit

Nam

2.4.1. Nguyn nhn khch quan

2.4.1.1. Cu trc a hnh

Hnh 2.1. S cc khu vc khng truy cp c dch v 3G trn a

bn mt s qun thnh ph H Ni

(Ngun: Hanoi WCDMA Report April 2011-Beijing Rising Technology)

Ghi ch: Mu l khu vc hon ton khng truy cp c dch v,

mu vng l khu vc kh truy cp dch v.

Hnh 2.2. S cc khu vc l vng cm trn a bn H Ni

(Ngun: Hanoi WCDMA Report April 2011-Beijing Rising

Technology)

Ghi ch: Mu l khu vc hon ton khng c sng 3G, mu vng

l khu vc c mc thu thp.

2.4.1.2. Suy hao v tuyn do thi tit

Kt qu o kho st cho thy, suy hao do thi tit Vit Nam i vi

bng tn 2GHz Vit Nam l kh ln. Do thi tit Vit Nam nm khu vc

cn nhit i gi ma. iu cho thy lng ma, my m Vit Nam

kh ln, nht l vo ma ng min bc v ma ma Vit Nam. c bit

l khu vc min bc c i ni cao, my m v ma ko di. iu ny nh

hng rt ln cht lng dch v, c bit l qu trnh truy nhp v tuyn,

phm vi ph sng. Kt qu kim tra tn s trn thit b phn tch ph tn hiu

v tuyn HP8563E cho thy, trong cn ma, tn s trung tm b lch kh ln

(khong 30% tn hiu trong mt bng). Nu o bng phng php 99% nng

lng ph th trong ma, nng lng ph gim t 30-32% suy hao do ma.

iu minh chng rt r rt v suy hao do ma i vi bng tn 2 GHz.

2.4.2. Nguyn nhn ch quan

2.4.2.1. Thit k v trin khai kin trc mng 3G

Hnh 2.3. S kin trc trin khai mng 3G kt hp mng 2G

ca cc doanh nghip Vit Nam giai on hin nay

2.4.2.2. Vng ph sng hn ch

2.4.2.3. Nhiu knh ln cn

2.4.2.4. Chuyn giao lin h thng

2.4.2.5. p lc u t

2.4.2.6. Nguyn nhn t thit b ca ngi s dng

2.5. Kt lun chng

Chng 3

MT S GII PHP NNG CAO CHT LNG MNG, DCH V

THNG TIN DI NG TH H TH BA

Chng ny tp trung d bo v s pht trin dch v, nhu cu s dng

trong tng lai. Trn c s kin ngh mt s gii php nng cao cht

lng dch v mng thng tin di ng th h th 3 Vit Nam trong giai

on t 2011 n 2015.

3.1. D bo v s pht trin dch v, nhu cu s dng dch v

Trn c s cc cng b v kt qu nghin cu, iu tra ca mt s

doanh nghip t vn pht trin th trng vin thng khu vc ni chung v

Vit Nam ni ring, mc d bo cc dch v v nhu cu s dng dch v ca

khch hng trong thi gian ti.

3.2. Mt s gii php nng cao cht lng mng, dch v 3G

3.2.1. T chc li mng 3G

3.2.1.1. Mc tiu ca gii php

3.2.1.2. Cn c ca gii php

3.2.1.3. Ni dung ca gii php

Doanh nghip cn tin hnh kho st, nh gi li ton b mng 3G

hin c, trn c s nh gi li vic trin khai mng 3G trong thi gian

qua. C th cn thc hin cc vic sau:

Th nht: Kho st li nhu cu s dng dch v 3G ca ngi s dng

dch v

Th hai: nh gi li nng lc phc v ca mng

Th ba: D bo v s tng trng thu bao.

Th t: u t v h tng, nng lc mng ph hp

C th u t theo cc hng nh sau:

Hng th nht: S dng chung mng li

Hnh 3.1. Phng n trin khai mng 3G chung mng li vi mng 2G

Hng th hai: u t thm mng li

Hnh 3.2. Phng n thm mng li cho mng 3G

3.2.2. S dng cc trm lp ph sng cc khu vc cm trong th

Mc tiu ca gii php l gim cc vng c cng tn hiu yu, cc

vng cm do a hnh

Ni dung ca gii php: S dng mt s Repeater cc khu vc

khng c sng 3G cc khu vc khu ph nh hp, khng trin khai c

trm NodeB. C 03 loi trm 3G Repeater c bn sau:

Loi 1 RFR (Radio Frequency Repeater)

Loi 2 - FSR (Frequency Shift Repeater): Tn hiu c chuyn

tip trn sng mang c tn s khc vi tn s trm gc (Node B).

Loi 3 - FOR (Fiber Optic Repeater): Tn hiu c chuyn tip trn

si quang.

3.2.3. Gii php ph sng trong nh cc ta nh cao tng

Mc tiu ca gii php ph sng khu vc cc nh cao tng m cc

trm lp t trn mt t khng th ph sng; ni c mt thu bao 3G

cao.

Ni dung ca gii php: S dng Femtocell l mt gii php cho hi

t c nh di ng, cung cp kt ni tc cao cho ngi dng trong nh.

Nhng tim nng v dch v a phng tin trong tng lai chnh l ng

lc trin khai femtocell.

Hnh 3.3. S kin trc trin khai Femtocell

- Gii php Iub trn IP: Gii php ny thch hp khi c t ngi kt

ni vi femtocell cng lc, v d trong gia nh hay vn phng t ngi.

Hnh 3.4. Kin trc gii php Iub-trn-IP

- Gii php Iu trn IP: Gii php ny thch hp cho s lng ngi s

dng dch v trong mt cng ty, vn phng c nhiu ngi.

Hnh 3.5. Kin trc gii php Iu trn IP

3.2.4. Nng cao nng lc chuyn giao gia h thng WCDMA v GSM

Mc tiu ca gii php: Hn ch vic phi chuyn giao lin h thng

v gim qu trnh x l ca h thng, tng cng hiu nng ca mng, gim

s dng ti nguyn mng cho vic chuyn giao.

Ni dung ca gii php: Trong ngn hn, cn u tin u t, pht

trin nhanh s lng trm NodeB khu vc th, c bit l cc th ln

c s lng khch hng s dng thit b u cui a dch v, c kh nng

lm vic 02 ch nh H Ni, thnh ph H Ch Minh, Nng, Cn

Th, Hi Phng y l c s k thut quan trng nhm gim qu trnh

chuyn giao gia mng 2G v 3G. V di hn, cn trin khai kin trc mng

theo hng k hp thng nht mng 2G v 3G.

Hnh 3.5. M hnh kin trc ng nht mng 2G v 3G

3.2.5. nh hng khai bo h thng ph hp vi nhu cu khch hng

3.2.5.1. Mc tiu ca gii php

Khai thc mt cch hiu qu, ti u nng lc ca h thng trong iu

kin u t cho h tng mng cn hn ch. Phc v ti a nhu cu ca ngi

s dng dch v, m bo s ph hp gia gi thnh dch v, doanh thu ca

doanh nghip v kinh ph u t ca doanh nghip.

Ni dung ca gii php: Cn kho st nhu cu s dng cc dch v ca

ngi dn. Trn c s khoanh vng cc khu vc dch v theo hng i

tng phc v theo tng dch v nhm tit kim ti nguyn mng.

3.3. Kt lun chng

KT LUN

nh gi cht lng mng v dch v 3G ni chung v mng 3G Vit

Nam ni ring a ra nhng kin ngh, xut nng cao cht lng l

mt ti mi v c ngha thc tin cao. n nay, Vit Nam v nhiu

quc gia khc trin khai mng 3G s dng cng ngh WCDMA u cha c

mt b tiu chun nh gi cht lng mng v dch v nn nh gi

cht lng mt mng 3G ni chung l ht sc kh khn. Phn ln cc nh

khai thc cng ngh ny u ch a ra nhng khi nim v mt s ch s

nh gi cht lng mng.

Lun vn c bn t c nhng kt qu c th sau:

Th nht: Khi qut c mt s ch tiu nhm nh gi cht lng

mng 3G bao gm: Ch tiu nh gi vng ph sng; kh nng truy nhp

mng, dch v; tin cy; kh nng di ng; thng lng; tr truy nhp

dch v.

Th hai: a ra cc mc tiu cn t c ca cc ch tiu ni trn

nhm m bo cht lng mng n nh, kh nng phc v tt.

Th ba: Cung cp thng tin kt qu o 03 mng 3G ln Vit Nam.

y l nhng kt qu o thng k qua thi gian kh di, m bo tin cy.

Th t: i chiu, so snh v a ra cc ch tiu m cc mng 3G

Vit Nam cha t c.

Th nm: Rt ra mt s nguyn nhn c bn nh hng cht lng

mng v dch v 3G Vit Nam.

Th su: xut mt s gii php nng cao cht lng mng 3G giai

on 2010-2015.

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Nghiên cứu 1 số giải pháp nâng cao chất lượng mạng 3G