Đo vÀ phÂn tÍch trong drive tets

7/31/2019 O V PHN TCH TRONG DRIVE TETS

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

TRN MNH QUANG

O V PHN TCH TRONG DRIVE TETS

LUN VN THC S K THUT

H NI 2011


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M U Hin nay, thng tin di ng vang tr thnh mt ngnh pht trin nhanh nht v phc

v cho con ng i hu hiu nht. p ng cc nhu cu cht l ng v dch v ngy cng cao,

thng tin di ng cng khng ngng c ci tin. Khi thng tin di ng pht trin th nhu cu cacon ngi i hi cht l ng dch v ngy cng cao.

Trong bi cnh hi nhp ca nn kinh t quc t, s cnh tranh gia cc doanh nghip din ra ngymt gay gt, c bit l trong l nh vc cng ngh thng tin v ccng dng khoa hc k thut. Vin thngcng l mt trongcc ngnh c tc pht trin v tng trng nhanh nht.

Vit Nam c 6 nh cung cp dch v di ng. ng vng v khng nh c thng hiu tr nth trng, nh cung cp dch v khng ch quan tm n mt nh hng pht trin lu di, s thay i v tduy kinh doanh hay nhng pht kin t ph v mt cng ngh m iu quan trng nht l h phi quan tm

n cht lng dch v bi l tiu ch h chim c t nh cm v s u i ca khch hng.

Nhng nm tr li y, cng nghvin thng ang c pht trin kh mnh, c bit l th h 3G, vang mang n cho ng i s dng nhiu dch v tin ch. Nhng bn cnh nhng dchv tin ch i hi phi c cht l ng vng ph sng, t lcuc gi thnh cng do vy ci thin vn trn th vn o kim Drive Test cn phi thc hin ngay sau khi pht sng dchv n ngi dng. Hn na, qua Drive Test th khong ph sng c th c ci thin, dung l ngm c m rng, hiu sut ca cht l ng dch v v ti nguyn mng c nng cao, do ccmng s c vn hnh tin cy hn v kinh t hn.

Lun vn i su vo nghin cu cc tham s KPIs (Key Performance Indicators) c bn vcch phn tch khi i o kim thc t ti trm. Vi nh hng nh vy, ni dung lun vn c b cc thnh3 chng nh sau:

Chng 1: Quy tr nh Drive Test trong mng vin thng di ng.

Chng 2: Vai tr ca KPIs (Key Performance Indicators) trong Drive Test v phn tch ccs liu trong KPIs.

Chng 3: Phn tch cc kt qu o thc t.


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Chng 1

QUY TRNH DRIVE TEST TRONG MNG

VIN THNG DI NG

1.1. TI SAO PHI CHN DRIVE TEST Trc khi a cc dch v vo s dng, a t i khch hng cn phi drive test cho cc trm

m bo trm c lp t ng v i thit k ( nh gc ngng ng ten, loi v cao ng ten, cao ct, tn s). o RSCP v Ec/Io ca knh CPICH kim tra vng ph c p ng tiu chunt ra trong bn knh ph thit khay khng. Kim tra xem dch v thoi, dch v hnh hotng v i cht lng ra sao v m bo yu cu ca nh mng hay khng.

1.2. MT S TH TC CHUN B TRC TRONG QU TR NH DRIVE TESTng i Drive test phi c xc nh cn thn tr c khi thc hin. Cc im sau phi

c cn nhc khi ln khoch o: Khong th i gian ti a cho mi cluster l 4h. scuc gi theo yu cu c

thcung cp mt s liu ng tin cy. Tc ca xe trong qu trnh di chuyn.

ng i phi i c h ng chnh ca Cells (hng bp sng chnh) xcnh bn knh ph sng ca cell. Nu o mt nhm cell thng i phi baogm tt c cc cell trong nhm. Tuy nhin ty theo a hnh thc t xy dng

ng i cho ph h p. Nu c th ng i phi c ln khoch c th i c handover c 2

chiu.

t nht tt c cc tuyn ng chnh phi c o.

1.3 . NHNG LI CH V HN CH TRONG QU TR NH DRIVE TEST

1.3.1. Li ch ca Drive test Ti to iu kin thu bao v quan im cht l ng dch vmng QoS.

Php o cn c thng nht bng nhng h thng thng tin di ng t tiu chun.

Cung cp so snh cht l ng gia cc nh khai thc mng khc nhau.

Qua php o cho php cc nh khai thc mng so snh cht l ng mng ca chnhhvi cc i th cnh tranh khc.

Tp trung vo ci t cc tham s c trng theo tng khu vc a l.


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1.3.2. Hn ch ca Drive test Kh khn ti to s dng m hnh thu bao. Vi cc thu bao o kim c thm

phng mt h thng di ng chun tmt vi quan im, n t chc nng n gin

chnh xc tnh c trngti to s dng thu bao d i dng tn sca cc cucgi nhn v cc dch v s dng.

S thu hp khu vc truy nhp c thgi i hn thc hin bi o kim.

Kh khn t lu nhanh c trong mng rng l n, gi i hn v th i gian v khuvc a l.

Ch yu ch phn tch ng lin kt ti xung.

i hi nhiu ti nguyn v chi ph cao.

1.4. CC CNG C CN THIT TRONG DRIVE TEST Ty theo mc ch o kim nh o kim trm m i tch h p pht sng hoc o kim vng

ph, cht l ng phc v qu trnh ti u ha m ngi o chun b cc c s d liu khc nhau.Cellfile: file.cel dng hin th cc v tr, tn cell ca trm NodeB trong mng (gm c site

ang hot ng v site danh nh).C s d liu trm NodeB gm a ch, ta , cu hnh trm, cao ng ten, gc tiu (tilt),

gc Azimuth.Mt bn dng nh hng ng i trong tr ng hp i o khng nm c a hnh

hoc GPS (Global Positioning Sytem-H thng nh v v tinh).

La bn xc nh gc Azimuth ca Cell.Trong tr ng hp okim phc v cng tc ti u trm th cn chun b thm bng KPIs

(Key Performance Indicators) ca Cell phc v cng tc phn tch s liu KPIs cn ti u. V i phn mm TEMS 8.03 hoc CNT, CNA.Ngun in cung cp c ni v i c quy ca xe chuyn thnh ngun 220V cho my tnh

v GPS.Laptop c ci sn phn mm truy cp v phn tch.

1.5. Kt lun chng chun b cho qu trnh Drive testc m bo v t cht l ng cao th khu chun b

cng dng c cng nh kin thc tin hnh ti u l cc k quan trng i vi ngi i o.

Chng 2

VAI TR CA KPIs (Key Performance Indicators) TRONG DRIVE TEST V PHN TCH CCS LIU TRONG KPIs

lm c cng vi c t i u v tuyn i hi nhn vin ph i hc hi, tm hi u c ki nth c nh t nh v mng di ng, c bi t ph i n m b t c ki n th c v qu trnh thi t l p cucgi, hiu c cc thng s k thut v phn c ng c ng nh phn mm. v c bi t ph i c


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tch l y kinh nghim th c t m i lm hi u qu c. Phn tch s liu th ng k l mt khu r t quan tr ng trong t i u (D liu th ng k v mng li c t ng h p v l y ra b ng ph n m mCNA, CNT v TEMS 8.03 y l phn m m giao di n ho tr gip truy v n c s d liu th ng

k ca cc Cell. N gip l y d liu th ng k v tnh tr ng ho t ng ca cc Cell mt khongth i gian nh t nh).

2.1. HIU QU S DNG TCH (Traffic Channel-Knh lu lng) 2.1.1. Cc knh trong WCDMA(Wideband Code Division Multiple Access-a truy nhp phnchia theo m bng rng)

Hnh 2.2. Kin trc giao th c giao din v tuynTrong UMTS c 3 kiu knh khc nhau cho truyn d liu v tn hiu c biu din hnh 2.2 vnh ngh a nh sau:

Knh vt l l p 1 (Layer 1). V i l p 1 ch yu lin quan n cc vn vgiao din vtuyn nh iu ch, m ha.

Knh truyn ti (giao thc gia l p 1 v lp 2). Trong lp 2 c chia thnh cc l p connh: MAC (Medium Access Control-iu khin truy nhp mi tr ng), RLC (Radio Link Control-iu khin lin kt), PDCP (Packet Data Convergence Protocol-Giao thc hi t s liu gi), BMC(Broadcast Multicast Control-iu khin a phng qung b).

Knh logic (giao thc gia l p 2 v lp 3). Trong lp 3 c phn chia trong cc l p conm l p con thp nht, bao gm RRC (Radio Resource Control-iu khin ti nguyn v tuyn), l pcon tip theo thc hin chc nng Duplication avoidance (trnh sao chp li). V cc lp cao hn

nh MM ( Mobility Management- Qun l lu ng), CC (Connection Management-Qun l ktni).2.1.1.1. Knh v t l

Mt knh vt l tng ng v i mt m, mt tn s sng mang c th. ch FDD(Frequency Division Duplex-Ghp song cng phn chia theo th i gian) knh vt l c cu trckhung v tuyn v khe th i gian. Khung v tuyn l mt khi x l bao gm 15 khe th i gian cchiu di 38400chip v khe th i gian l mt khi cha cc tr ng bit c chiu di 2560chip. Cuhnh khe th i gian bin i tu thuc vo tc knh vt l. V thsbt trn mt khe th i gian c


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th khc nhau i v i mi knh vt l khc nhau. Cc knh vt l c phn loi da trn hai ctrng:

Knh ng ln v ng xung Knh dnh ring v knh chung.

2.1.1.2. Knh truy n t i Knh truyn ti c s dng nh giao thc gia l p 1 v l p 2 ca kin trc giao thc giao

din mng v tuyn. Chng c chia ra thnh:- Knh truyn ti chung (tt ccc knh tr knh DCH-Dedicated Channel-Knh ring ): l

ti ngyn c chia scho tt choc mt nhm cc ng i s dng trong v c sdng pht thng tin cho tt c cc ng i s dng nhng khng cn a ch.

- Knh truyn ti ring ch c mt knh duy nht l DCH (Dedicated Channel-Knh ring)v c n nh ring cho mt ng i s dng duy nht.

- Knh truyn ti m tng h p (CCTrCH-Coded Composite Traffic Channel) c sdngkt h p mt vi knh truyn ti bn trong mt knh truyn ti mi. Knh ny c nh x t imt hoc mt vi knh vt l ty thuc vo yu cu ca tc bit. Knh ny thc hin cc tiuchun sau:

Ti a 5 knh truyn ti c th c kt h p t i mt knh CCTrCH.

Ch c knh truyn ti c thit lp hot ng c th c nh x t i mt knhCCTrCH.

Nhng knh CCTrCH khc nhau khng c th c nh x vo nhng knh vt lging nhau.

Knh truyn ti ring v chung khng thkt h p vo knh CCTrCH ging nhau.

V i knh truyn ti chung, ch c knh FACH v PCH m i thuc knh CCTrCHging nhau.

2.1.1.3. Knh logicKnh logic c s dng nh giao thc gia l p 2 v l p 3 ca kin trc giao din giao thc

v tuyn.Cc dch v truyn s liu khc nhau phn l p MAC c cc bknh logic. Cc knh logic

c th c chia thnh hai nhm ch yu l: nhm knh iu khin v nhm knh lu l ng.2.1.1.4. S nh x gi a cc knh

2.1.2. Khi knh lu lng (Traffic Channel BlockingTCH_Cong)Php o tlca php th nh v mt knh TCH m c ngn chn do thiu ti

nguyn knh TCH . iu ny khng bao gm khi ch nh TCH th m tip ni theo nh c th tc hng i.

(2.2) Attempts Assignment TCH Total

s Assignment TCH Blocked CongTCH

______


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2.1.3. Cuc gi rt Khng thc hin RF (TCH_RF_Loss) Php o tl ca cuc gi thit lp thnh cng m rt do TCH RF Loss (nh khc bit t

HO_Fail_Drop)

(2.3)2.1.4. T l khng thc hin ch nh k nh TCH (TCH Assignment Failure Rate TCH_Ass_Flr)

Php o tlca knh thTCH ch nh m li sau xc nh knh TCHv tr c khi honthnh th tc ci t cuc gi.

(2.4)

2.1.5. Nghn k nh TCH

T l nghn knh TCH (T_CONGR) c tnh bng t l % tng s cuc gi b r t donghn knh TCH trn tng s ln gn knh TCH.

2.1.5.1. Cng th c

TASSALL TNRELCONG)(CNRELCONGx100 (%)R_CONGT (2.5)

2.2. HIU QU S DNG SDCCH

2.2.1. Chc nng k nh SDCCH (Stand-alone Dedicated Control Channel-Knh iu khin ring dichuyn c lp)

- Mang tn hiu ci t cuc gi.- Gn IMSI (International Mobile Subcriber Identity-Nhn dng thu bao di ng quc t).- G b IMSI.- Ci t cuc gi.- Cp nht v tr.- Tin nhn SMS (Short Message Service-Dch v nhn tin).- Thm cc dch v.

2.2.2. Chiu di ca k nh SDCCHMt knh SDCCH c ch nh ti ng i s dng bng knh AGCH (Aceess Grant

Channel-Knh cho php thm nhp) l cc cp truy cp knh c s dng trong cc h thng GSM(Global System for Mobile Communications-H thng thng tin di ng ton cu). iu ny ch nh mt knh kim sot u tin danh ring cho mi in thoi khng dy. V c bn, AGCH lnhng g cung cp cc ngun nhn lc kt ni v i mng) chu trch nhim truy cp ngu nhin(RACH) theo yu cu cho mt knh.

Tn hiu sng mang SDCCH gia MS v BTS trong khi khng c lu l ng knh (TCH) c khi ng.

SetupsCallCompleted lySuccessful Losses RF TCH Total Loss RF TCH

________

Attempts Assignment TCH TotalFailures Assignment TCH

Flr AssTCH ___

____


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2.2.3. Khi k nh SDCCH (SDCCH Channel Blocking-SD_Cong)Php o tlca s th ch nh knh SDCCH m c ngn chn do thiu ti nguyn

SDCCH

(2.6)2.2.4. T l thnh cng truy nhp knh SDCCH (SDCCH Access Success Rate-SD_Acc_Scc)Php o tlca s ln cgng ch nh tc th i m kt qu trong ch nh thnh cng t i

knh SDCCH cho tt c cc nguyn nhn ci t cuc gi bao gm cp nht v tr..(2.7)

2.2.5. T l nghn k nh SDCCH

T lngh n knh SDCCH l t l% s ln cgng cp pht knh SDCCH khng thnh cngtrn s ln cgng cp pht knh SDCCH.

100(%)_ xCCALLS CCONGS

CONGRSD (2.8)

2.3. S LIU CHUYN GIAO Chuyn giao l phng tin cn thit thu bao c th di ng trong mng. Khi thu bao

chuyn t vng ph sng ca mt cell ny sang vng ph sng ca mt cell khc th kt ni v i cellm i phi c thit lp v kt ni v i cell c phi b hy b.

L do c bn thc hin chuyn giao l kt ni v tuyn khng tha mn mt b tiuchun nht nh dn n hoc UE hoc UTRAN (UMTS Terrestrial Radio Access Network-Mngtruy nhp v tuyn mt t UMTS) s thc hin cc cng vic ci thin kt ni . HthngWCDMA s dng chuyn giao on-the-fly khi thc hin cc cuc gi chuyn mch knh. Khi thchin cc kt ni chuyn mch gi, chuyn giao thc hin c khi UE v mng truyn gi khngthnh cng.

Chuyn giao do nguyn nhn lu l ng xyra khi dung l ng ca cell t t i gi i hn ti acho php hoc vt qu ng ng t i hn . Khi cc thu bao ngoi ra cell c mt cao s c chuyn sang cc cell bn cnh c mt thp. Bng cch , ti h thng s c phn b uv nhu cu v dung l ng v vng ph sng s c iu chnh hiu qu p ng nhu cu lul ng trong mng.

2.3.1. Chuyn giao gia cc cell trong cng BSS (Inter-BSS Handover) xc nh t lca s ln cgng chuyn giao gia cc cell trong cng BSS (Inter-BSS)

m hon thnh thnh cng.

2.3.2. Chuyn giao trong cng cell (Intra-BSS Handover) xc nh t lca s ln cgng chuyn giao trong cng cell (Intra-BSS) hon thnh

thnh cng.

Attempts Assignment SDCCH Total

s Assignment SDCCH Blocked CongSD

___

___

Attempts Assignment mediateTotals Assignment mediateSuccessful

Suc AccSD__Im_

_Im___


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2.3.3. Chuyn giao cng tn s (Intra-frequency Handovers)2.3.3.1. Thu t ton chuy n giao

Chuyn giao mm s dng in hnh knh CPICH (Common Pilot Channel-Knh hoa tiu chung)

Ec/Io (=pilot Ec/Io ) nh s lng php o chuyn giao m c chuyn t i RNC bng cch s dng tn hiu L p 3.2.3.3.2. Php o chuy n giaoWCDMA UE qut lin tc nhng cell khc nhau trn nhng tn sging nhau khi trng

thi cell_DCH. UE in hnh s dng mt b lc tng ng tm knhng b u tin PCH cacell ln cn. Tt c cc cell truyn mng bging nhau m UE tm. Thm UE nhn dng cc cellvi knh ng b th 2, S-SCH v knh pilot CPICH.

T khi WCDMA Node B c th khng ng b, UE gii m khc skhung h thng (SFN)t cell ln cn. SFN ch th th i gian Node B vi phn gii khung 10ms. SFN c truyn trnknh pht thanh BCH mang trn vt l iu khin chung u tin P-CCPCH.Giai o n 1: Nh n d ng cell Giai o n 2: Gi i m s khung h th ng (SFN-System Frame Number)

2.3.4. Chuyn giao gia cc h thng ca WCDMA v GSMWCDMA v GSM tiu chun h tr chuyn giao c 2 phng thc cho WCDMA v GSM .

Chuyn giao ny c thdng cho vng ph hoc vn cn bng ti. Vo nhng thi im bt upht trin WCDMA, chuyn giao t i GSM l cn thit cung cp vng ph lin tc v chuyngiao tGSM t i WCDMA c th thng c sdng ti d liu thp trong cell GSM.

Chuyn giao gia h thng c thit lp t ngun RNC/BNC v t h thng thu, chuyngiao cng h thng l tng t nh chuyn giao trong cng RNC hoc chuyn giao trong cngBSC. Thut ton chuyn giao v bkhi ng th ng khng tiu chun.

2.3.5. Chuyn giao gia cc tn s trong phm vi WCDMA Hu ht cc nh khai thc UMTS u c hai hoc ba tn sFDD. S hot ng bt u s

dng mt tn sv hai tn sv ba tn s l cn thit sau m bo dung l ng mng. Mt vitn s c th s dng theo 2 cch khc nhau v thhin hnh 2.14: mt vi tn s nhng trmging nhau cho nhng trm dung l ng cao hoc l p macro v micro sdng tn skhc nhau.

2.3.6. T l thnh cng chuyn giao ( Handover Success Rate - HOSR)

Php o tlca tng kt quchuyn giao o thtrong chuyn giao c honh thnhthnh cng bao gm bn trong cell, bn trong BSS v bn trong chuyn giao BSS.(2.9)

2.3.7. T l li chuyn giao (Handove Failure Rate HOFR)T l php o ca chuyn giao th m kt qukhng thc hin chuyn giao v i cuc gi

r t (v d khng bao chuyn giao th rng li v phc hi t i cell ngun).(2.10)

Attempots Handover TotalhandoversSuccessfulTotal

HOSR____

Attempts Handover Total DropFail HOTotal

HOFR__

___


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2.3.8. Nguyn nhn ca chuyn giao

- Do cht l ng tn hiu thu km (RxQUAL qu cao).

- Mc tn hiu thu c RxLEV qu thp.

- Khong cch gia MS v BTS qu xa: Khong cch qu l n khin cho kh nng b trtruynsng bng s dng gi tr TA (Timing Advance-thi gian xc nh tng i khong cch). Nu gitr TA ln hn gi tr quy nh c gn cho mt MS th s khng b tr truyn sng, th tcchuyn giao s c kch hot.

- Do qu d tr cng sut (cng tn hiu t Serving Cell nh hn gi tr ng ng d tr cng sut ti thiu hoc mt Cell khc tt hn c suy hao ng truyn nh hn Serving Cell).

- Do chia ti Cell (Cell Load Sharing).

- Do s can thip ca OMC (Operation & Maintenance Center-Trung tm vn hnh v bod ng).

- Do nhiu.

2.4. THIT LP KT NI

2.4.1. T l thnh cng cuc gi(Call Success Rate-CSR)- xc nh phn trm cuc gi c ci t thnh cng v kt ni t i thit b u cui

cch thng thng (v d nh khng r t cuc gi).- T lcuc gi thnh cng l mt ch th tt ton b t i s n nh mng. N l s kt h p

t l thnh cng cuc gi v t l r t cuc gi bng mt con s v tnh ton chung nh cng thcdi y:

(2.11)

2.4.2. T l thnh cng ci t cuc gi ( Call Setup Success Rate-CSSR)2.4.2.1. nh ngh a xc nh t lca vic thc hin cuc gi m kt qu l s thnh cng cuc gi thnh

cng ( v d nh ci t cuc gi thnh cng) v nhn dng v xc nh s l ng l do ring bitcho ci t cuc gi li.CSSR= Successfully Completed Call Setups / Total Valid Call Setup Attempts

( ) ( ) %100*1=SR*1= TASSALLTCASSALL

SDR TASDR (2.12)Trong :

- SDR l t l r t knh SDCCH.

- TCASSALL l s ln gn knh TCH thnh cng.

- TASSALL l s ln gn knh TCH2.4.2.2. Lu thi t l p cuc gi thnh cng v ho t ng ca cc tham s trn trong h

th ng


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Nguyn nhn dn n r t SDCCH l do cht l ng tn hiu km, cng tn hiu thp,nghn knh TCH v mt snguyn nhn khc. Bng cch ti u v tng dung l ng mng c th khc phc c vn ny.

Nguyn nhn gn knh TCH khng thnh cng ch yu l do thiu knh v nghn. Nh vy tng TCASSALL cn tng thm knh TCH.

2.4.3. T l rt cuc gi (Call Drop Rate-CDR):Ch tiu cuc gi rt c tnh ton theo cng thc chung nh sau:

(2.13)

2.5. GII THIU S QUA DRIVE TEST TRONG CDMA

2.5.1. nh ngha Qu trnh Drive Test trong CDMA cng nh trong cc mng khc u m bo duy tr cht

l ng cuc gi tt nht ( t l r t cuc gi thp v cht l ng m thanh tt), tit kim th i gian vgim gi thnh u t thng qua kthut sng v tuyn cho h thng tbo CDMA.

2.5.2. Ch s thc hin CDMA 2.5.2.1.Ch s th c hin RF Php o v tham strng yu CDMA thhin iu kin ca mi tr ng RF. Chng l

nhng tiu chun c bn h ng dn cc vn v ti u trong CDMA. Nh chth ng ln, ng xung v chai. Nhng tham s ny c thu v ti cc im thu bao u cui v v vy n

d ly c khi sn sng s dng cc thit b thng mi khng c yu cu tr gip ti BSC.2.5.2.2. Ch s th c hin RF tr ng y u CDMAFER Frame Erasure Rate-T lxa khung knh ng ln (nhn dng ti my cm tay),

knh d tr (nhn dng ti trm gc). FER l cht l ng cuc gi hon ho thng k tng h p .

2.6. K t lun chng Qua chng ny chng ta tm hiu c nhim v, chc nng v ngh a ca cc knh

thc hin trong mng. Hiu c cc vn trong chuyn giao gia cc cell v i nhau.Bit c mt cch c bn cc tham s trong mng CDMA (Code Division Multiplex

Access-a truy nhp phn chia theo m). Qua thy c s khc nhau r rt gia cc mng ding v i nhau.

Chng 3

PHN TCH CC KT QU O THC T 3.1. LOGFILE CC KT QU O BNG MY TEMS

)_incoming_(_______

handoverssuccessfulSetupsCallCompleted lySuccessful DropFail HO Losses RF TCH

DCR


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Hnh 3.2. Best Aggr Ec/Io


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3.2. PHN TCH CC KT QU OTHC T

o kim tra dch v thoi c hnh (video call): s dng hai thit b u cui c h

tr video call gi cho nhau, ng th i kt ni vo my o ghi kt qu. Sau nhgi dch v c hot ng khng? Cht lng c m bo khng? Nu dch v khng hotng hoc cht lng khng t th tr c ht kim tra vng ph, kim tra dch v thoisau kim tra n u cui v khai bo thng s lin quan.

o kim dch v PS 99 DL v UL: t UE ch R99 v s dng nh modemkt ni kt ni my tnh v i mt my ch ftp, thc hin ti file d liu mu xunghoc ln my ch o throughput ca cell.

o kim dch vPS HSPA DL v UL: thc hin nh o kim dch v PS 99DLv UL nhng chn UE ch HSPA (HSDPA ng xung v HSUPA cho ng

ln). Bng 3.2. Gii thch mu ca RSCP

RSCP(dBm) Ch thch mu Kt qu

RSCP-105 Rt xu, khng vng ph

-105 RSCP-95Xu, vng ph bn ngoi khng mbo.

-95 RSCP-85Bnh th ng, vng ph bn trongkhng m

-85 RSCP-75Rt tt, vng ph bn trong c phnno m bo.

-75 RSCP-65Tt, vng ph bn trong c th mbo.

RSCP -65 Cc k tt

Bng 3.3. Gii thch mu cho Ec/Io

Ec/Io(dB) Ch thch mu Kt qu

Ec/Io-20 Rt xu, khng c vng ph


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-20 Ec/Io-14Vng ph xu, tc bt ca dch v chuyn mch gi l thp, cht l ngthng tin khng mbo.

-14 Ec/Io-12Vng ph bnh th ng cho cuc giging ni, tc bt ca dch v chuyn mch gi khng m bo.

-12 Ec/Io-8Cuc gi hnhnh m bo, tc nhnh dch v chuyn mch gi phnno c m bo.

-8 Ec/Io-5 Vng ph tt cho tt c c dch v.

Ec/Io -5 Cc k tt

3.3. MT VI NH GI, SO SNH

3.3.1. Vng ph yu

3.3.2. Vn mt hoa tiu

Do vy, ta thy sau khi i ti u th tt c cc tham s ca KPIs u ngyu cu v tha

mn. Chng ta sc mt iu t ho m bo rng khch hng s tha mn v i tt c cc dch v ti tnh Tha Thin Hu.

Chng ta sgi thng k lu l ng mng gim st mng chng ta se gm c vng phvnhiu cng nhau tm ra cc vn v xc nhn chng ng th i gian.

V gi i hn ca cao ng-ten v khong cch gia cc trm qu xa dn n mt vi tr ngh p l vng ph khng c ci thin nhiu. N thuc vo danh sch tn ti cc vn v ngh trin khai thm trm trong nhng trin khai tip sau m bo cht l ng vng ph v dchv.

3.4. K t lun chng Qua chng ny chng ta hiu thm kh nhiu vcc tham s ca Drive Test.

Hiu c cch phn tch kt qu thc t, t c cc kin ngh xut t i nh khai thcmng nng cao cht l ng dch v ca mng hn na.


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KT LUN

Drive Test trong mng di ng l mt vn rt rng v mang nhiu ngh a thctin. y l cng vic i hi nhiu cng sc thu thp v phn tch nhiu loi s liu.

Hn na, dung l ng s liu th ng rt ln v a dng. Do vy, cn phi c nhiu th igian tp trung x l s liu. nh h ng ca lun vn l i su vo phn tch mt s thams KPIs c bn trong qu trnh Drive Test.

Trn c s nhng kin thc thu c trong qu trnh hc tp v o to ti Hcvin, cng nh sch bo tn tnh v gip ca thy gio TS. L Ch Qunh lun vncao hc nghin cu v gii quyt c cc vn sau:

- Nghin cu c quy trnh Drive Test trong mng vin thng di ng.

- Nghin cu c vai tr ca KPIs (Key Performance Indicators) trong Drive Test

v phn tch cc s liu trong KPIs.- Phn tch c cc kt qu o thc t.

Bn cnh do phng php nghin cu ch yu da trn cc l lun v mt lthuyt tm hiu qu trnho kim trong mng di ng nhm p ng tt hn na nhucu s dng cc dch v ca khch hng v lun vn chc khng trnh khi nhng thiust, rt mong c s ch bo ca cc Thy gio, c gio trong Hc vin cng nh cabn b cng l p.

Mt ln na, em xin chn thnh cm n sgip tn tnh ca cc thy c gio trong

Hc vin, bn b cng l p trong th i gian hc tp ti Hc vin, c bit em xin trn trngcm n s h ng dn tn tnh ca thy gio TS. L Ch Qunh gip em hon thnhlun vn cao hc ny.

Đo vÀ phÂn tÍch trong drive tets

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