tìm hiểu máy tems

7/30/2019 tm hiu my tems

1/7

B CNG THNGTRNG CAO NG K THUT CAO THNG

KHOA IN T- TIN HC

TI

: TM HIU MY TEMS


2/7

MC LCTrang

LI NI U..................................................................................................................1

DANH SCH T VIT TT .........................................................................................3

PHN M U ..............................................................................................................9

Phn I

TNG QUAN V MNG GSM

Chng 1

GII THIU CHUNG V MNG GSM

1.1.Lch s pht trin mng GSM ............................................................................................................. 11

1.2.Cu trc a l ca mng..................................................................................................................... 12

1.2.1. Vng phc v PLMN (Public Land Mobile Network) ............................................................ 13

1.2.2. Vng phc v MSC............................................................................................................... 14

1.2.3. Vng nh v (LA - Location Area) ....................................................................................... 141.2.4. Cell (T bo hay ) ............................................................................................................... 14

Chng 2

H THNG THNG TIN DI NG GSM

2.1.M hnh h thng thng tin di ng GSM ........................................................................................... 16

2.2.Cc thnh phn chc nng trong h thng ........................................................................................... 17

2.2.1. Trm di ng (MS - Mobile Station)...................................................................................... 17

2.2.2. Phn h trm gc (BSS - Base Station Subsystem) ................................................................. 18

2.2.2.1.Khi BTS (Base Tranceiver Station):..................................................................................... 18

2.2.2.2.Khi TRAU (Transcode/Rate Adapter Unit): ......................................................................... 18

2.2.2.3.Khi BSC (Base Station Controller): ..................................................................................... 19

2.2.3. Phn h chuyn mch (SS - Switching Subsystem) ................................................................ 20


3/7

2.2.3.1.Trung tm chuyn mch di ng MSC:.................................................................................. 20

2.2.3.2.B ghi nh v thng tr (HLR- Home Location Register): .............. .............. ............ .......... 22

2.2.3.3.B ghi nh v tm tr (VLR- Visitor Location Register): ............. .............. ............ .............. 22

2.2.3.4.Thanh ghi nhn dng thit b (EIR- Equipment Identity Register):.......................... ........... .... 23

2.2.3.5.Khi trung tm nhn thc AuC (Aunthentication Center)....................................................... 23

2.2.4. Phn h khai thc v bo dng (OSS) .................................................................................. 23

2.2.4.1.Khai thc v bo dng mng: .............................................................................................. 24

2.2.4.2.Qun l thu bao: .................................................................................................................. 24

2.2.4.3.Qun l thit b di ng: ........................................................................................................ 25

2.3.Giao din v tuyn s ......................................................................................................................... 25

2.3.1. Knh vt l ........................................................................................................................... 25

2.3.2. Knh logic ............................................................................................................................ 26

2.4.Cc m nhn dng s dng trong h thng GSM ................................................................................. 29

Phn II

TEMS INVESTIGATION

Chng 1

Tm hiu v thit b Tems

1.1. Gii thiu v Tems ....................................................................................................................... 34

1.2.Lm quen vi Tems ............................................................................................................................ 35

1.2.1. Chun b ............................................................................................................................ 35

1.2.2. Tin hnh Driving Test ......................................................................................................... 36

1.3. Thanh cng c trn Tems ............................................................................................................ 45

1.3.1. Thanh cng c thit b kim sot ................................................................................. 45

1.3.2. Thanh cng c kt ni .................................................................................................... 45

1.3.3. Thanh cng c ghi li: .................................................................................................... 45

1.3.4. Thanh cng c Replay .................................................................................................... 461.3.5. Thanh cng c bo co................................................................................................... 46

1.3.6. Thanh cng c phn tch l trnh.................................................................................. 46

1.3.7. Thanh cng c xem tp tin ............................................................................................ 47


4/7

1.3.8. Phn kt ni ...................................................................................................................... 47

1.3.9. ngha biu tng.......................................................................................................... 47

1.4. The map window toolbar............................................................................................................. 48

Chng 2

O KIM MNG DI NG

4.1.H thng thng tin di ng t bo........................................................... Error! Bookmark not defined.

4.2.Quy hoch Cell...................................................................................... Error! Bookmark not defined.

4.2.1. Khi nim t bo (Cell) ............................................................Error! Bookmark not defined.

4.2.2. Kch thc Cell v phng thc ph sng ................................ Error! Bookmark not defined.

4.2.2.1.Kch thc Cell........................................................................ Error! Bookmark not defined.

4.2.2.2.Phng thc ph sng.............................................................. Error! Bookmark not defined.

4.2.3. Chia Cell (Cells Splitting) ........................................................ Error! Bookmark not defined.4.3.Quy hoch tn s ................................................................................... Error! Bookmark not defined.

4.3.1. Ti s dng li tn s ............................................................... Error! Bookmark not defined.

4.3.2. Cc mu ti s dng tn s ....................................................... Error! Bookmark not defined.

4.3.2.1.Mu ti s dng tn s 3/9:....................................................... Error! Bookmark not defined.

4.3.2.2.Mu ti s dng tn s 4/12:..................................................... Error! Bookmark not defined.

4.3.2.3.Mu ti s dng tn s 7/21:..................................................... Error! Bookmark not defined.

4.3.3. Thay i quy hoch tn s theo phn b lu lng.................... Error! Bookmark not defined.

4.3.3.1.Thay i quy hoch tn s........................................................ Error! Bookmark not defined.

4.3.3.2.Quy hoch ph sng khng lin tc .......................................... Error! Bookmark not defined.4.3.4. Thit k tn s theo phng php MRP (Multiple Reuse Patterns)Error! Bookmark not defined.

4.3.4.1.Nhy tn _ Frequency Hopping ................................................ Error! Bookmark not defined.

4.3.4.2.Phng php a mu s dng li MRP _ Multiple Reuse PatternsError! Bookmark not defined.

4.4.Antenna .................................................................................................Error! Bookmark not defined.

4.4.1. Kiu loi anten:........................................................................ Error! Bookmark not defined.

4.4.2. tng ch anten (Gain of an Antenna) .................................... Error! Bookmark not defined.

4.4.3. Cng sut bc x ng hng tng ng - EIRP ............. ...... Error! Bookmark not defined.

4.4.4. cao v gc nghing (down tilt) ca anten:............................ Error! Bookmark not defined.

4.5.Chuyn giao cuc gi (Handover) .......................................................... Error! Bookmark not defined.4.5.1. Phn loi Handover.................................................................. Error! Bookmark not defined.

4.5.2. Khi to th tc Handover....................................................... Error! Bookmark not defined.

4.5.3. Quy trnh chuyn giao cuc gi ................................................ Error! Bookmark not defined.


5/7

Chng V

CC CH TIU CHT LNG H THNG

5.1.Khi nim v cht lng dch v QOS ................................................................................................ 73

5.2.Cc i lng c trng ...................................................................................................................... 735.2.1. T l thit lp cuc gi thnh cng CSSR (Call Setup Successful Rate) ............. ............... ...... 73

5.2.2. T l rt cuc gi trung bnh (Average Drop Call Rate - AVDR) ..................... ............ .......... 74

5.2.3. T l rt mch trn TCH (TCH Drop Rate - TCDR) ............. .............. ............ .............. ......... 74

5.2.4. T l nghn mch TCH (TCH Blocking Rate - TCBR) .......................................................... 75

5.2.5. T l rt mch trn SDCCH (SDCCH Drop Rate - CCDR) ............. .............. ............ .............. 78

5.2.6. T l nghn mch trn SDCCH (SDCCH Blocking Rate - CCBR) ................... ............. ......... 79

5.2.7. Mt s i lng c trng khc ........................................................................................... 80

5.2.7.1.S knh hot ng (Available Channels) ............................................................................... 80

5.2.7.2.T l thnh cng handover n (Incoming HO Successful Rate - IHOSR) .............. .............. .. 80

5.2.7.3.T l thnh cng handover ra (Outgoing HO Successful Rate - OHOSR) .................... ........... 81

5.2.7.4.EMPD .................................................................................................................................. 82

5.2.7.5.Thi gian chim mch trung bnh (MHT - Mean Holding Time) ............ .............. ............ ...... 82

5.3.Cc ch tiu cht lng thc t mng VMS_MobiFone ........................... Error! Bookmark not defined.

5.3.1. S liu thng k cht lng mng hin ti................................. Error! Bookmark not defined.

5.3.2. Nhn xt, nh gi ................................................................... Error! Bookmark not defined.

5.4.Mt s gii thch v cc thut ng thng dng .............. .............. .......... Error! Bookmark not defined.

Chng VI

MT S MINH HA CNG TC TI U HA MNG VMS_MOBIFONE

6.1.o kim tra Handover gia hai trm ................................................................................................... 83

6.2.Phn tch kt qu o sng pht hin nhiu tn s............................................................................. 85

6.3.Thc hin m rng TRX nng cao ch tiu cht lng........................ Error! Bookmark not defined.

KT LUN .................................................................................................................... 88

TI LIU THAM KHO

...................................................Error! Bookmark not defined.

PH LC .............................................................................Error! Bookmark not defined.


6/7

Trn biu ph tn hiu thu c ta thy: mt s v tr c ch s C/ I

rt thp, c nhng lc b gim xung di 9dB (gi tr C/ I b nht m cht

lng c th chp nhn c theo khuyn ngh GSM ). Mc nhiu ng knh

qu cao l nguyn nhn dn n s lng yu cu Handover tng t bintrong khi mc thu tn hiu vn tt (RxLevel khong -52 dBm). Nhiu tn s

xut hin lm cho tn hiu m thoi d b ngt qung, nghe khng r, nh

hng n cht lng thoi. Nu ko di s lm cuc gi b rt mch.

Kt lun: Mc nhiu ng knh nh vy l vt qu mc cho php,

iu ny c th l do khi thc hin quy hoch tn s c s khai bo nhm

tn s (sau khi kim tra d liu mng cho thy 2 trm BTS ti An Giang khai

bo cng tn s BCCH). Nh vy cn kim tra v tin hnh khai bo li tn s m bo yu cu.


7/7

KT LUN

*** n tt nghip trnh by nhng nt c bn nht v mng thng tin

di ng GSM, cng vi mt s cng tc Driving Test ti u ha h thng

c thc hin ti mng GSM. Driving Test lm nhim v gim st v kim

tra ri t mi a ra cc cng vic thc hin ti u ho.

Do thi gian thc tp c hn v nhng hn ch khng trnh khi ca

vic hiu bit cc vn da trn l thuyt l chnh nn bo co tt nghip ca

em chc chn khng trnh khi nhng thiu st. Em rt mong c c nhng kin nh gi, gp ca cc thy v cc bn n thm hon thin.

Qua thi gian thc tp em thy Driving Test l mt mng ti rng v

lun cn thit cho cc mng vin thng hin ti ni chung v mng thng tin

di ng ni ring. Kh nng ng dng ca ti l gip ch cho nhng ngi

lm cng tc ti u ho mng, l c s l thuyt phn tch v tin hnh, t

hon ton c th tm ra gii php ti u khoa hc nht. V phn mnh, em

tin tng rng trong tng lai nu c lm vic trong lnh vc ny, em stip tc c s nghin cu mt cch su sc hn na v ti ny.

Mt ln na, em xin chn thnh cm n Trng d n Driving Test

Nguyn T Hng Sn Cng Ty CT-IN chi nhnh min Nam v Trng Hong

Hoa Thm khoa in T Tin Hc to iu kin gip em trong t thc

tp tt nghip.

tìm hiểu máy tems

Documents