Tai lieu thiet bi 2G.pdf

Bo co th vic i v tuyn

Trang 3

MC LC TM TT TI ........................................................................................................ 9 PHN I......................................................................................................................... 10 TM HIU V TRUNG TM THNG TIN DI NG KHU VC 2 (VMS C2) . 10 Chng 1. S lc v lch s VMS ............................................................................. 11 Chng 2. C cu t chc VMS - Mobifone ............................................................... 13 Chng 3. C cu t chc VMS C2 ......................................................................... 15

3.1. M hnh iu hnh k thut mng thng tin di ng VMS: ......................... 16 3.2. Quy ch iu hnh ti Trung Tm TTD khu vc II: .................................. 17

3.2.1. Mc ch: ............................................................................................... 17 3.2.2. Chc nng iu hnh: ............................................................................ 17 3.2.3. Mi quan h: .......................................................................................... 18

3.3. i v tuyn .................................................................................................. 18 3.3.1. C cu t chc: .......................................................................................... 18 3.3.2. Chc nng: ................................................................................................. 19 3.3.3. Nhim v: .................................................................................................. 19 3.3.4. Quyn hn: ................................................................................................. 20

PHN II. ...................................................................................................................... 21 TM HIU THIT B RBS 2000 CA ERICSSON ................................................... 21 Chng 1. Tng quan v mng GSM .......................................................................... 22

1.1. Gii thiu: ...................................................................................................... 22 1.2. Cc thng s k thut ca mng GSM: ......................................................... 23 1.3. Cc b phn chnh trong h thng GSM: ...................................................... 24

1.3.1. Phn h chuyn mch SS (Switch System) : ......................................... 24 1.3.1.1. MSC: (Mobile service Swiching Center): ...................................... 24 1.3.1.2. HLR (Home Location Register) : ................................................... 25 1.3.1.3. VLR (Visitor Location Register): ................................................... 25 1.3.1.4. AUC (Authentication Center): ....................................................... 25

1.3.2. Phn h BSS (Base Station System): ..................................................... 25 1.3.2.1. BTS (Base Transceiver Station): .................................................... 27 1.3.2.2. BSC (Base Station Controller): ...................................................... 27 1.3.2.3. MS (Mobile Station): ...................................................................... 27

1.3.3. Phn h khai thc v bo dng OSS: ................................................... 28 1.3.3.1. Khai thc v bo dng: ................................................................. 29 1.3.3.2. Qun l thu bao:............................................................................ 29 1.3.3.3. Qun l thit b di ng: ................................................................. 29

Chng 2. RBS 2206 ................................................................................................... 31 2.1. V tr v chc nng ca RBS trong mng GSM: ........................................... 31

2.1.1. V tr: ...................................................................................................... 31 2.1.1.1. Giao din A-BIS: ............................................................................ 31 2.1.1.2. Giao din v tuyn: ........................................................................ 32

2.1.2. Chc nng ca RBS: .............................................................................. 33


Trang 4

2.1.3. Kt lun: ................................................................................................. 34 2.2. H thit b RBS 2000 ca Ericsson: .............................................................. 35

A. Distribution Switch Unit - DXU: .............................................................. 36 a. Chc nng ca DXU: ............................................................................. 36 b. Cc thnh phn chnh ca DXU: ........................................................... 37

b.1. PCM part: ....................................................................................... 37 b.2. CPU part: ........................................................................................ 38 b.3. CTU part: ........................................................................................ 38 b.4. HDLC Concentrator (LAPD Concentration) : ............................... 38 b.5. TGSync: .......................................................................................... 38

B. Transceiver Unit - TRU: ............................................................................ 38 a. Chc nng ca TRU: ............................................................................. 39 b. Cc thnh phn chnh ca TRU: ............................................................ 39

b.1. Digital Block (TRUD): ................................................................... 39 b.2. Transmitter Block (TX-block): ...................................................... 39 b.3. Receiver Block (RX-block): ........................................................... 40

C. Combining and Distribution Unit - CDU: ................................................. 40 a. Chc nng ca CDU: ............................................................................. 40 b. Cc thnh phn chnh ca CDU:............................................................ 40

b.1. Combiner: ....................................................................................... 40 b.2. RXDA (Receiver (RX) Divider Amplifier): ................................. 41 b.3. Duplexer: ........................................................................................ 41 b.4. RF filter: ......................................................................................... 41

c. Cc loi CDU: ........................................................................................ 42 c.1. CDU - A: ........................................................................................ 42 c.2. CDU loi C v C+: ......................................................................... 43 c.3. CDU - D: ........................................................................................ 43

D. Energy Control Unit - ECU: ........................................................................ 44 Chc nng ca ECU: ..................................................................................... 44

E. Power Supply Unit PSU: ........................................................................... 45 F. Internal Distribution Module IDM: ........................................................... 45

2.3. Thit b RBS 2206 ca Ericsson: .................................................................. 46 2.3.1. Gii thiu: .............................................................................................. 46 2.3.2. Cc thnh phn chnh trong t RBS 2206: ............................................ 47

2.3.2.1. Power Supply Unit PSU: ............................................................. 47 2.3.2.2. Internal Distribution Module IDM: ............................................. 48 2.3.2.3. Double Transceiver Unit dTRU: ................................................. 49 2.3.2.4. Distribution Switch Unit DXU: ................................................... 50 2.3.2.5. Configuration Switch Unit CXU: ................................................ 50 2.3.2.6. Combining and Distribution Unit CDU: ..................................... 51

a. CDU-G: .................................................................................................. 51 b. CDU-F: .................................................................................................. 52


Trang 5

2.3.2.7. AC Connection Unit/DC Connection Unit - ACCU/DCCU v DC Filter: 52 2.3.2.8. Fan Control Unit FCU: ................................................................ 53

2.3.3. Cc kt ni RF: ...................................................................................... 53 2.3.3.1. Kt ni CDU-G: ............................................................................. 54

a. S kt ni: ......................................................................................... 54 b. Kt ni gia CDU-G v dTRU: ............................................................. 55

b.1. C v khng c b ghp Hybrid: .................................................... 55 b.2. Cu hnh 1+1+2: ............................................................................. 56

2.3.3.2. Kt ni CDU-F: .............................................................................. 57 a. S kt ni: ......................................................................................... 57 b. Kt ni gia CDU-F vi dTRU: ............................................................ 58 c. Kt ni gia cc CDU-F: ....................................................................... 59

2.3.3.3. Kt ni cp ASU: ........................................................................... 59 2.3.4. Cc cu hnh cho thit b RBS 2206: ..................................................... 61

2.3.4.1. Kt ni vi Anten: .......................................................................... 61 2.3.4.2. Cu hnh vi CDU-F: ..................................................................... 62

a. Kt ni vi anten: ................................................................................... 62 b. Cc cu hnh: ......................................................................................... 63

b.1. Cu hnh 3x2 v 3x4: ...................................................................... 63 b.2. Cu hnh 1x8: ................................................................................. 64 b.3. Cu hnh 1x12: ............................................................................... 65 b.4. Cu hnh 2x6: ................................................................................. 65 b.5. Cu hnh 1x4 + 1x8: ....................................................................... 66 b.6. Cu hnh: 1x8 + 1x4: ...................................................................... 67

2.3.4.3. Cu hnh vi CDU-G: .................................................................... 67 a. Kt ni vi Anten: ................................................................................. 67 b. Cc cu hnh: ......................................................................................... 68

b.1. Cu hnh 3x2 v 3x4: ...................................................................... 68 b.2. Cu hnh 1x8: ................................................................................. 68 b.3. Cu hnh 1x12: ............................................................................... 69 b.4. Cu hnh 2x6: ................................................................................. 70

2.3.5. Thay i cu hnh, tng gim nhm thu pht: ....................................... 71 2.3.5.1. Cu hnh vi ng b TG: .............................................................. 71 2.3.5.2. Kt ni cp ESB: ............................................................................ 72

2.3.6. Kt lun: ................................................................................................. 75 Chng 3. RBS 2216 v RBS 2116 ............................................................................. 76

3.1 Thit b RBS 2216 ca Ericsson: .................................................................. 76 3.1.1. Gii thiu: .............................................................................................. 76 3.1.2. Cc khi chc nng phn cng ca RBS 2216: ..................................... 78 3.1.2.1. Cc khi chc nng chun: ................................................................ 78 3.1.2.1.1. DRU : ................................................................................................. 78 3.1.2.1.2. ACCU: ................................................................................................ 84


Trang 6

3.1.2.1.3. DCCU: ................................................................................................ 87 3.1.2.1.4. DXU: .................................................................................................. 88 3.1.2.1.5. FCU: ................................................................................................... 92 3.1.2.1.6. IDM: ................................................................................................... 94 3.1.2.1.7. PSU: ................................................................................................... 96 3.1.2.1.8. RX Slitter: .......................................................................................... 98 3.1.2.2. Cc khi chc nng ty chn: ............................................................ 98 3.1.2.3. Giao tip v kt ni: ........................................................................... 99 3.1.2.4. Giao din ngi dng: ...................................................................... 100

3.2 Thit b RBS 2116: ...................................................................................... 101 3.2.1. Gii thiu: ............................................................................................ 101 3.2.2. Kch thc, khi lng v mi trng hot ng: .............................. 101 3.2.3. Cc khi chc nng trong RBS 2116: ................................................. 102

3.3 Cc cu hnh cho thit b RBS 2x16: .......................................................... 103 3.3.1. Cu hnh v tuyn cho RBS:................................................................ 103 3.3.1.1. Nhng cu hnh RX c bn: ............................................................. 105 3.3.1.2. Nhng cu hnh TX c bn: ............................................................. 120 3.3.1.3. Cu hnh cell: ................................................................................... 122 3.3.1.3.1. SCC cho 1 RBS: ............................................................................... 122 3.3.2. Cu hnh anten cho RBS: ..................................................................... 142 3.3.2.1. Cu hnh RX: .................................................................................... 145 3.3.2.2. Cu hnh TX: .................................................................................... 150 3.3.3. Kt ni RF: ........................................................................................... 152 3.3.4. Thay i cu hnh v tng gim nhm thu pht: ................................. 159 3.3.4.1. Thay i cu hnh: ............................................................................ 159 3.3.4.2. Tng gim nhm thu pht: ............................................................... 159 3.3.5. Kt lun: ............................................................................................... 160

Chng 4. RBS 2111 ................................................................................................. 161 4.1. Gii thiu ........................................................................................................ 161 4.2. Tng quan ....................................................................................................... 161

4.2.1 Chc nng chnh ...................................................................................... 161 4.2.2 Cc thng s chnh .................................................................................. 162 4.2.3 Cc thit b tu chn ................................................................................ 162

4.2.3.1 Cc thit b tu chn cho b MU ........................................................ 162 4.2.3.2 Cc thit b tu chn cho b RRU-N .................................................. 162 4.2.3.3 Cc thit b tu chn khc ................................................................... 162

a. Hp phn phi ngun AC (AC PD Box): ................................................... 162 b. Bo v qu p AC Cat IV: .......................................................................... 162 c. B chia ngoi: ............................................................................................. 163

4.3 Kch thc ....................................................................................................... 163 4.3.1 Kch thc ca b MU ............................................................................ 163 4.3.2 Kch thc ca b RRU-N ...................................................................... 164

4.4 Cc phn cng ca RBS 2111 ........................................................................ 165


Trang 7

4.4.1 Cc phn cng ca b MU ...................................................................... 165 4.4.1.1 MU ...................................................................................................... 166 4.4.1.2 V bo v trong ................................................................................... 166 4.4.1.3 Cc giao tip kt ni ........................................................................... 166

4.4.2 Cc phn cng ca b RRU-N ................................................................ 166 4.4.2.1 RRU-N ................................................................................................ 167 4.4.2.2 V bo v ............................................................................................ 167 4.4.2.3 Cc giao tip kt ni ........................................................................... 167

4.4.3 Yu cu v cp quang s dng ................................................................ 167 4.5 Cc giao tip kt ni ca b MU .................................................................... 167

4.5.1 Giao tip ni t ...................................................................................... 168 4.5.2 Giao tip ngun AC ................................................................................. 169 4.5.3 Giao tip ngun -48 V DC ....................................................................... 170 4.5.4 Giao tip truyn dn ................................................................................ 171 4.5.5 Giao tip cnh bo ngoi ......................................................................... 172 4.5.6 Giao tip ng b ngoi ESB .................................................................. 173 4.5.7 Giao tip OMT......................................................................................... 174 4.5.8 Giao tip tng i .................................................................................... 174 4.5.9 Giao tip quang ........................................................................................ 174

4.6 Cc giao tip kt ni ca RRU N ................................................................. 175 4.6.1 Giao tip ni t ...................................................................................... 176 4.6.2 Giao tip ngun AC ................................................................................. 177 4.6.3 Giao tip ngun -48 V DC ....................................................................... 178 4.6.4 Giao tip quang ........................................................................................ 179 4.6.5 Giao tip tng i .................................................................................... 180 4.6.6 Giao tip Anten ........................................................................................ 180 4.6.7 Giao tip kt ni lin kt ......................................................................... 181 4.6.8 Giao tip cu hnh .................................................................................... 182

4.7 Cc cu hnh cho thit b RBS 2111 ............................................................... 182 4.7.1 Cu hnh v tuyn cho RBS 2111 ........................................................... 182

4.7.1.1. Cu hnh c bn 9d_2.2 v 18d_2.2 ................................................. 183 4.7.1.2 Cu hnh c bn 9dh_1.2\s v 18dh_1.2\s ........................................... 186 4.7.1.3 Cu hnh c bn 9dh_2.4 v 18dh_2.4 ................................................ 187 4.7.1.4 Cu hnh c bn 9dh_3.6 v 18dh_3.6 ................................................ 188 4.7.1.5 Cu hnh c bn 9d_2.2\b v 18d_2.2\b .............................................. 189

4.7.2 Cc cu hnh Site Cell (SCC) ................................................................. 190 4.7.2.1 Cu hnh n bng tn ........................................................................ 190

4.7.2.1.1 SCC trn 1 RBS ............................................................................ 190 4.7.2.1.1.1 Cc cu hnh khng kt hp 1 sector ...................................... 191 4.7.2.1.1.2 Cc cu hnh kt hp 1 sector .................................................. 191 4.7.2.1.1.3 Cc cu hnh khng kt hp 2 sector ...................................... 191 4.7.2.1.1.4 Cc cu hnh hn hp 2 sector ................................................ 191 4.7.2.1.1.5 Cu hnh kt hp v c chia s tn hiu RX 2 sector............... 192


Trang 8

4.7.2.1.1.6 Cc cu hnh khng kt hp 3 sector ...................................... 192 4.7.2.1.2 Cu hnh SCC trn 2 RBS ............................................................ 192

4.7.2.2 Cc cu hnh song tn ......................................................................... 194 4.7.2.2.1 Cc cu hnh SCC trn mt RBS .................................................. 194 4.7.2.2.2 Cc cu hnh SCC trn 2 RBS ...................................................... 195

4.7.3 Kt ni anten tng ng cc cu hnh c bn ca RBS 2111 ................. 200 4.7.3.1 Cu hnh khng kt hp 3x2 RRU N ............................................... 200 4.7.3.2 Cu hnh khng kt hp 1x6 RRU N ............................................... 201 4.7.3.3 Cu hnh 1x2 RRU N vi Highway Coverage ................................ 202

4.8 Kt ni RF tng ng cc cu hnh c bn ca RBS 2111: ........................... 203 4.8.1 RBS 2111 TRU khng c Hybrid Combiner: ......................................... 203 4.8.2 RBS 2111 TRU C Hybrid Combiner..................................................... 203

4.8.2.1 Cu hnh 1X4 RRU-N ......................................................................... 203 4.8.2.2 Cu hnh 1X6 RRU-N ......................................................................... 204

4.8.3 Cu hnh RBS 2111 chia s tn hiu RX gia 2 RBS: ............................ 207 Chng 5: Dng OMT khai bo trm BTS ........................................................... 208

5.1. Stand-alone v Cascade: .......................................................................... 209 5.2. Master-Extension: .................................................................................... 212 5.3. Ci data cho flashcard: ............................................................................ 214 5.4. Kt lun: .................................................................................................. 219

Chng 6: Cnh bo v x l cnh bo trong h RBS 2000 ..................................... 220 6.1 Thng bo li RBS: ................................................................................. 220 6.2 Tm thng tin li: ..................................................................................... 220 6.3 Trng thi ca cc LED: .......................................................................... 221

6.3.1 LED bo li (): ............................................................................ 221 6.3.2 Local Mode LED (Vng): ................................................................ 222 6.3.3 Cc vn vi Local mode led: ....................................................... 222

6.4 Hng dn khc phc li:........................................................................ 223 6.4.1 Khc phc ti BSC: .......................................................................... 223 6.4.2 Khc phc ti ch: ............................................................................ 223

6.5 Kt lun: .................................................................................................. 223


Trang 9

TM TT TI

Theo s phn cng ca T trng T Vin thng 1, Anh Trn Quang Ngha, thuc i V Tuyn - Trung tm thng tin di ng khu vc 2 Cng ty thng tin di ng (VMS), cng vi s h tr nhit tnh t cc ng nghip, n nay ti hon thnh tm hiu ti th vic: Tm hiu thit b RBS 2000 ca Ericsson. Theo b cc, ti c chia lm 2 phn:

Phn I. Tm hiu v Trung Tm Thng Tin Di ng Khu Vc 2 (VMS C2)

Chng 1. S lc v lch s VMS

Chng 2. C cu t chc VMS - Mobifone

Chng 3. C cu t chc VMS C2

Phn II. Tm hiu thit b RBS 2000 ca Ericsson

Chng 1. Tng quan v mng GSM

Chng 2. RBS 2206

Chng 3. RBS 2216 v RBS 2116

Chng 4. RBS 2111

Chng 5. Dng OMT ci t cho RBS

Chng 6. Cnh bo v x l cnh bo


Trang 10

PHN I. TM HIU V TRUNG TM THNG

TIN DI NG KHU VC 2 (VMS C2)


Trang 11

Chng 1. S lc v lch s VMS

Cng ty thng tin di ng (VMS) l Doanh nghip Nh nc trc thuc Tp on Bu chnh Vin thng Vit nam (VNPT). c thnh lp vo ngy 16 thng 04 nm 1993, VMS tr thnh doanh nghip u tin khai thc dch v thng tin di ng GMS 900/1800 vi thng hiu MobiFone, nh du cho s khi u ca ngnh thng tin di ng Vit Nam. Lnh vc hot ng ca MobiFone l t chc thit k xy dng, pht trin mng li v trin khai cung cp dch v mi v thng tin di ng.

1993: Thnh lp Cng ty Thng tin di ng, Gim c cng ty ng inh Vn Phc.

1994: Thnh lp Trung tm Thng tin di ng Khu vc I & II.

1995: Cng ty Thng tin di ng k Hp ng hp tc kinh doanh (BCC) vi Tp on Kinnevik/Comvik (Thy in) .

Thnh lp Trung tm Thng tin di ng Khu vc III.

2005: Cng ty Thng tin di ng k thanh l Hp ng hp tc kinh doanh (BCC) vi Tp on Kinnevik/Comvik.

Nh nc v B Bu chnh Vin thng (nay l B Thng tin v Truyn thng) c quyt nh chnh thc v vic c phn ho Cng ty Thng tin di ng. ng L Ngc Minh ln lm Gim c Cng ty Thng tin di ng thay ng inh Vn Phc (v ngh hu).

2006: Thnh lp Trung tm thng tin di ng Khu vc IV.

2008: Thnh lp Trung tm thng tin di ng Khu vc V. K nim 15 nm thnh lp Cng ty thng tin di ng.

Thnh lp Trung tm Dch v Gi tr Gia tng.

Tnh n thng 04/2008, MobiFone ang chim lnh v tr s 1 v th phn thu bao di ng ti Vit Nam.


Trang 12

TNG TRNG THU BAO QUA CC NM 1993-2010

BIU PHN CHIA TH PHN (TNH N QU I/2009)

MobiFone l nh cung cp mng thng tin di ng u tin v duy nht ti Vit Nam (2005-2008) c khch hng yu mn, bnh chn cho gii thng mng thng tin di ng tt nht trong nm ti L trao gii Vietnam Mobile Awards do tp ch Echip Mobile t chc. c bit trong nm 2009, MobiFone vinh d nhn gii thng Mng di ng xut sc nht nm 2008 do B thng tin v Truyn thng Vit nam trao tng.


Trang 13

Chng 2. C cu t chc VMS - Mobifone

Hin nay, Cng ty Thng tin di ng c 5 Trung tm Thng tin di ng trc thuc, mt Trung tm Dch v Gi tr gia tng (VAS) v mt X nghip thit k.

Tr s chnh ca Vn phng Cng ty t ti H Ni.

a ch: S 216 ng Trn Duy Hng, Qun Cu Giy, Thnh ph H Ni.


Trang 14

- Trung tm Thng tin di ng khu vc I (VMS C1) c tr s chnh ti H Ni, chu trch nhim kinh doanh v khai thc mng thng tin di ng khu vc min Bc (cc tnh pha Bc n H Tnh):

a ch: S 811A ng Gii Phng, Qun Hong Mai, Thnh ph H Ni.

- Trung tm Thng tin di ng khu vc II (VMS C2) c tr s chnh ti TP. H Ch Minh, chu trch nhim kinh doanh v khai thc mng thng tin di ng khu vc min Nam (t tnh Ninh Thun n cc tnh min ng Nam B, TP H Ch Minh v Long An):

a ch: MM18 ng Trng Sn, Phng 14, Qun 10, Thnh ph H Ch Minh.

- Trung tm Thng tin di ng khu vc III (VMS C3) c tr s chnh ti Nng, chu trch nhim kinh doanh v khai thc mng thng tin di ng khu vc min Trung v Cao Nguyn (t tnh Qung Bnh n tnh Khnh Ho v tnh c Lc:

a ch: S 263 ng Nguyn Vn Linh, Thnh ph Nng.

- Trung tm Thng tin di ng khu vc IV (VMS C4) c tr s chnh ti Cn Th, chu trch nhim kinh doanh v khai thc mng thng tin di ng khu vc 10 tnh min Ty Nam B:

a ch: 51F ng Nguyn Tri, Qun Ninh Kiu, Thnh ph Cn Th.

- Trung tm Thng tin di ng khu vc V (VMS C5) c tr s chnh ti Hi Phng, chu trch nhim kinh doanh v khai thc mng thng tin di ng khu vc ti 14 tnh, thnh ph pha Bc:

a ch: S 332 ng Ng Gia T, Qun Hi An, Thnh ph Hi Phng.

- Trung tm Dch v Gi tr gia tng c thnh lp ngy 06/10/2008 c tr s chnh ti Thnh ph H ni, c chc nng pht trin, qun l, khai thc v kinh doanh cc dch v gi tr gia tng trn mng thng tin di ng (bao gm dch v SMS, dch v trn nn SMS, trn nn GPRS, 3G v dch v chuyn vng quc gia, quc t).

- X nghip thit k thnh lp ngy 21 thng 1 nm 1997 c tr s ti H Ni vi nhim v t vn, kho st, thit k xy dng cc cng trnh thng tin di ng.


Trang 15

Chng 3. C cu t chc VMS C2

GIM C TRUNG TM

CC PH GIM C

P. T CHC HNH CHNH

P. K TON THNG K TI CHNH

P. QUN L U T XY DNG

T XT THU

09 CHI NHNH

P. K HOCH BN HNG

P. CHM SC KHC HNG

I 1090

P. THANH TON CC PH

PHNG

K

THUT

KHAI

THC

I

V

TUYN

I

CHUYN

MCH

PHNG

TIN

HC

TNH

CC

I

V

TUYN

MIN

NG

C CU T CHC TRUNG TM THNG TIN DI NG KHU VC 2 (VMS C2)


Trang 16

3.1. M hnh iu hnh k thut mng thng tin di ng VMS:

CNG TY THNG TIN DI NG

TRUNG TMTTD KV I

P.HKT

i CM&i VT

TRUNG TMTTD KV II

P.HKT

i CM&i VT

TRUNG TMTTD KV III

P.HKT

i GSM

TRUNG TMTTD KV IV

P.HKT

i GSM

TRUNG TMTTD KV V

P.HKT

i GSM

Phng HKT VMS

Hnh 3.1.1: C cu iu hnh k thut Cng Ty Thng Tin Di ng

M hnh iu hnh mng li ca Cng ty Thng Tin Di ng c chia thnh hai cp nh s trn, gm cp Cng ty v cp Trung tm. Qun l iu hnh (QLH) mng li Cng ty bao gm: Lnh o Cng

ty, Phng HKT. QLH Cng ty trc tip ch o cng tc qun l, iu hnh mng li trong ton cng ty i vi cc cng tc iu hnh khai thc k thut c phn cp nh: - Chuyn v tr phc v ca MSC, HLR, RCP, GPRS, MMSC, SMSC,

BSC, Site, Cell, tuyn truyn dn trong phm vi ton Cng ty. - Khai bo cu hnh nh a ch im bo hiu, tn s vi ba, cu hnh kt

ni, dung lng, nng cp cc phn t trn mng v cc dch v. - Chuyn di cc my thu pht TRX, TRU, cc card chnh v card d

phng ca thit b trn mng v mt s thit b ph tr ca trm BTS. - M, ng cc tuyn lin lc nh trung k lin i, trung k ti cc thnh

phn trong mng v cc tuyn truyn s liu t tng i ti cc h thng qun l mng, tnh cc v.v

QLH Trung tm bao gm: Gim c Trung tm, Ph gim c Trung tm, Phng HKT, Tr ng i GSM hoc Trng i V tuyn v Trng i Chuyn mch. QLH Trung tm chu trch nhim t chc, lp phng n thc hin cc lnh iu hnh ca QLH Cng ty, ch o thay i TRX, TRU, cc trung k, bo hiu ni b mng GSM khu vc, cc tuyn truyn s liu ti h thng u ni, qun l khch hng ph hp vi tnh hnh vn hnh v khai thc mng.


Trang 17

3.2. Quy ch iu hnh ti Trung Tm TTD khu vc II:

Hnh 3.2.1: C cu iu hnh Trung Tm TTD khu vc II

3.2.1. Mc ch:

Nhm kim sot, duy tr v nng cao cc ch tiu cht lng mng, m bo an ton mng li TTD ti Trung tm TTD Khu vc II.

Xy dng mi quan h trong cng tc iu hnh gia cc n v: Phng K Thut, i V Tuyn, i Chuyn Mch, cc phng lin quan, cc n v bn ngoi Trung tm v B phn iu hnh ti Trung tm II.

Nhm nng cao hiu qu qu trnh qun l v x l thng tin theo quy trnh qun l iu hnh 7.5-01 ca Cng Ty, quy ch iu hnh ca Tng Cng ty.

3.2.2. Chc nng iu hnh:

Thuc B phn iu hnh, bao gm: gim st tnh hnh mng li, gim st cc ch tiu cht lng mng, dch v, iu hnh x l thng tin m bo an ton mng li.

, 5

Cc t Vin thng


Trang 18

3.2.3. Mi quan h: B phn iu hnh l u mi tip nhn thng tin t iu hnh trung tm,

iu hnh cng ty, theo di vic t chc thc hin v bo co kt qu ln iu hnh trung tm, iu hnh cng ty.

B phn iu hnh iu hnh trc tip (h tr, ch o, tip nhn kt qu) cc b phn trc thuc phng, i: T ti u, Cc ca trc, Cc t vin thng vng, T bo dng mng trin khai cc cng vic lin quan n cng tc iu hnh.

Phng HKT, i Chuyn mch, i V tuyn c trch nhim h tr theo yu cu ca BPH.

B phn iu hnh c quyn quan h vi cc n v thuc TT2, cc n v lin quan trong cng tc iu hnh mng li.

3.3. i v tuyn

3.3.1. C cu t chc:

LNH O I

T BO DNG MNG

T PHT TRIN MNG

T VIN THNG 1

T VIN THNG 2

T VIN THNG 3

T VIN THNG 4

T VIN THNG TY

NINH

T VIN THNG LONG

AN

CC CHUYN VIN

Hnh 3.3.1.1: C cu t chc i V Tuyn Trong , khu vc qun l ca 06 T Vin thng c phn chia nh sau: + T Vin thng 1 (Pha ng Thnh Ph): Gm cc qun 1, 2, 3, 9, Bnh Thnh, Th c.

+ T Vin thng 2 (Pha bc Thnh Ph): Gm cc qun 12, Ph Nhun, G Vp, Tn Bnh, v 2 huyn C Chi, Hc Mn. + T Vin thng 3 (Pha ty Thnh Ph): Gm cc qun 5, 6, 8, 10, 11, Tn Ph, Bnh Tn v huyn Bnh Chnh.


Trang 19

+ T Vin thng 4 (Pha nam Thnh Ph): Gm cc qun 4, 7, v 2 huyn Nh B, Cn Gi. + T Vin thng Ty Ninh: Ph trch tnh Ty Ninh. + T Vin thng Long An: Ph trch tnh Long An.

3.3.2. Chc nng:

i V tuyn l n v sn xut trc tip thuc Trung tm thng tin di ng KV II, c chc nng gip Gim c Trung tm thc hin cc mt cng tc sau: Qun l, vn hnh, khai thc, bo dng cc h thng mng v tuyn BSS

tnh t giao din A Interface n Air Interface bao gm cc TC (Transcoder), MFS, BSC, OMCR, BTS, Microcell, Picocell, Repeater, cc thit b v tuyn khc, h thng truyn dn v cc thit b o v tuyn.

Phi hp gim st, lp t, nghim thu, pht sng cc thit b ca cc Phase pht trin thuc phm vi cng vic c giao.

ng cu, x l s c trn mng li bo m thng tin lin lc. Qun l, thanh ton cc hp ng thu nh trm, thu ct anten, bo v,

in v nhin liu i vi cc trm, tuyn truyn dn,

3.3.3. Nhim v: Qun l lao ng, ton b ti sn, cng c, dng c c giao, vt t v

trang thit b thuc n v mnh ph trch v s dng ng mc ch, nhim v theo quy nh ca nh nc, ca ngnh, ca Cng ty v ca Trung tm nhm pht huy cao kh nng, nng lc ca CBCNV.

Qun l ton b thit b trn mng (k c trm BTS v thit b truyn dn ti cc tng i), thit b, vt t trong kho, dng c phng tin k thut c Trung tm giao qun l.

Qun l cu hnh kt ni, cc thng s, tham s tt c cc trm, tuyn truyn dn c Trung tm giao. Theo di, gim st cht lng hot ng ca mng li, bo co tnh hnh cht lng theo phn cp. Thc hin cc cng tc thay i trn mng v cc cng tc nhm duy tr v nng cao cht lng mng li.

Theo di, kim tra thng xuyn s hot ng ca cc trm BTS, cc tuyn truyn dn, cc cng trnh, thit b ph tr, bo co khi pht hin iu bt thng. Thc hin iu chnh, sa cha phc v tt nht theo yu cu SXKD.


Trang 20

nh k bo tr, bo dng cc thit b thng tin, nh trm v cc thit b ph tr trn Mng thng tin di ng VMS khu vc pha Nam.

T chc khc phc mi s c trong thi gian ngn nht. Bo m thng tin lin lc lin tc trn mng.

Tin hnh sa cha thit b thng tin, thit b ph tr khi c h hng. Thc hin cng tc an ninh bo mt, ATVSL v PCCN, bo m mi

iu kin v nhit , mi trng v an ton cho cc thit b thng tin hot ng tt.

Phi hp thc hin, theo di, kim tra, lp t hoc gim st lp t thit b mi theo cc k hoch ca Cng ty v Trung tm.

Qun l, thanh ton cc hp ng t trm, ct anten, in, nhin liu theo ng thi hn v quy nh.

Thc hin ch bo co nh k, bo co t xut ng quy nh. Tun th c ch iu hnh thng tin (iu hnh Cng ty -> iu hnh

Trung tm -> i Chuyn mch / i V tuyn) trong hot ng vn hnh, khai thc, nng cp pht trin, ti u mng li v x l cc s c.

3.3.4. Quyn hn: c tha lnh Gim c Trung tm t chc thc hin cc chc nng,

nhim v ca mnh. c quyn lin h vi cc n v lin quan trong v ngoi n v thc

hin cc nhim v c giao. Xem xt, trnh Lnh o Trung tm khen thng hoc k lut kp thi i

vi tp th v c nhn ca n v c thnh tch hoc vi phm cc quy nh, khng hon thnh nhim v c giao.

c xut iu ng b tr nhn lc trong phng trnh Gim c Trung tm quyt nh.


Trang 21

PHN II. TM HIU THIT B RBS 2000 CA

ERICSSON


Trang 22

Chng 1. Tng quan v mng GSM 1.1. Gii thiu:

- Mng vin thng t bo l mt trong cc ng dng k thut vin thng c nhu cu ln nht v pht trin nhanh nht. GSM (Global system for mobile communication h thng thng tin di ng ton cu) vi tiu chun thng s ton Chu u mi, s gii quyt s hn ch dung lng hin nay. Thc cht dung lng s tng 2 3 ln nh vic s dng tn s tt hn v k thut nh, do vy s thu bao phc v s tng ln.

- Lu ng v hon ton t ng, bn c th em my di ng ca mnh khi i du lch v s dng mt nc khc. H thng s t ng cp nht thng tin v v tr ca bn cho h thng ti nh bn. Bn cng c th gi i v nhn cuc gi n m ngi gi khng cn bit v tr ca bn. Ngoi tnh lu ng quc t, tiu chun GSM cn cung cp mt s tnh nng nh thng tin tc cao, faxcimile v dch v thng bo ngn. Cc my in thoi di ng s ngy cng nh hn v tiu th t cng sut hn cc th h trc chng.

- Tiu chun GSM c thit k c th kt hp vi ISDN v tng thch vi mi trng di ng. Nh vy tng tc gia hai tiu chun ny c m bo.

- Nm 1982 GSM bt u pht trin khi cc nc Bc u gi ngh n CEPT quy nh mt dch v vin thng chung Chu u bng tn 900 MHz.

- T nm 1982 n nm 1985 ngi ta bn lun v vic xy dng mt h thng s hay tng t. Nm 1985 quyt nh h thng s. Bc tip theo l chn la gii php bng hp v bng rng.

- Nm 1986 mt cuc kim tra ngoi hin trng c t chc ti Paris cc hng khc nhau ua ti vi cc gii php ca mnh.

- Thng 05/1987 gii php TDMA bng hp c la chn, ng thi cc hng khai thc k bin b n ghi nh MoU (Memorandem of Understanding) thc hin cc quy nh ha s c 1 GSM vn hnh vo 01/07/91.

- Ericsson c b dy kinh nghim trong vic thit k v sn xut h thng t ong. H thng CME20 cho GSM c thit k trn c s chuyn mch s AXE10. nc ta hin nay c ba h thng in thoi di ng GSM l VMS Mobifone, Vinaphone v Vietel.

- V cht lng: Chc nng u tin ca CME20 l cung cp mt dch v in thoi di ng

tin cy v cht lng tt. Cc th h my di ng khc nhau cng s dng nhiu loi dch v s liu mi khng cn mt modem ring.


Trang 23

GSM vic ng k thu bao c ghi modun nhn dng thu bao SIM (Subscribe Identity Module) c kch thc nh mt tm tn phiu. Bn c th cm card thu bao ca mnh vo loi my GSM v ch mnh s dng n. H thng s kim tra vic ng k thu bao ng v card khng b ly cp. Qu trnh ny c t ng thc hin bng mt th tc nhn thc thng qua mt trung tm nhn thc.

Tnh bo mt cng c tng cng nh vic s dng mt m s ngn chn hon ton vic nghe trm v tuyn.

iu kin tng i tt, cht lng ting GSM ngang bng vi h thng tng t. Tuy nhin, cc iu kin ti do tn hiu yu hay do nhiu giao thoa nng, GSM c cht lng tt hn.

Vic s dng cng ngh mi lm cc my in thoi di ng nh v nh hn, s dng ch ng ngh t ng lm cho tui th c qui di hn.

1.2. Cc thng s k thut ca mng GSM: GSM 900:

- Tn s : Uplink : 890MHz 915MHz Downlink : 935MHz 960MHz

- Khong cch duplex : 45MHz, l khong cch gia mt tn s uplink v tn s downlink tng ng.

- Khong cch gia hai knh k cn : 200KHz, l khong tn s an ton cn thit gia hai knh k cn m bo cho vic truyn phi gim nhiu xuyn knh.

- Phng thc truy nhp : TDMA. - S knh cho mt tn s: 8 knh. - Phng php iu ch : GMSK (Gaussian Minimum Shift Keying).

GSM 1800: - Tn s :

Uplink : 1710MHz 1785MHz Downlink : 1805MHz 1880MHz

- Khong cch duplex : 95MHz - Khong cch gia hai knh k cn : 200KHz. - Phng thc truy nhp : TDMA. - S knh cho mt tn s: 8 knh. - Phng php iu ch : GMSK (Gaussian Minimum Shift Keying).


Trang 24

1.3. Cc b phn chnh trong h thng GSM:

Hnh 1.3.1: Cu hnh mng GSM.

c chia lm 3 phn h:

- Phn h chuyn mch SS.

- Phn h trm gc BSS.

- Phn h khai thc bo dng OSS.

1.3.1. Phn h chuyn mch SS (Switch System) :

H thng con chuyn mch bao gm cc chc nng chuyn mch chnh ca GSM cng nh c s d liu cn thit cho s liu thu bao v qun l di ng ca thu bao. Chc nng chnh ca SS l qun l thng tin gia nhng ngi s dng mng GSM vi nhau v vi mng khc.

1.3.1.1. MSC: (Mobile service Swiching Center):

SS chc nng chuyn mch chnh c MSC thc hin, nhim v chnh ca MSC l iu phi vic thit lp cuc gi n nhng ngi s dng mng


Trang 25

GSM. Mt mt MSC giao tip vi h thng con BSS, mt khc giao tip vi mng ngoi. MSC lm nhim v giao tip vi mng ngoi gi l MSC cng (GMSC). Vic giao tip vi mng ngoi m bo thng tin cho nhng ngi s dng mng GSM i h i cng thch ng (cc chc nng tng tc IWF: interworking function). SS cng c n giao tip vi mng ngoi s dng cc kh nng ca cc mng ny cho vic truyn ti s liu ca ngi s dng hoc bo hiu gia cc phn t ca mng GSM. Chng hn SS c th s dng mng bo hiu knh chung s 7 (CCS No), mng ny m bo hot ng tng tc gia cc phn t ca SS trong mt hay nhiu mng GSM.

1.3.1.2. HLR (Home Location Register) :

Ngoi MSC, SS bao gm cc c s d liu. Cc thng tin lin quan n vic cung cp cc dch v vin thng c lu gi HLR khng ph thuc vo v tr hin thi ca thu bao. Thng HLR l mt my tnh ng ring khng c kh nng chuyn mch nhng c kh nng qun l hng trm ngn thu bao. Mt chc nng con ca HLR l nhn dng trung tm nhn thc AUC m nhim v ca trung tm ny qun l an ton s liu ca cc thu bao c php.

1.3.1.3. VLR (Visitor Location Register):

VLR l c s d liu th hai trong mng GSM. N c ni mt hay nhiu MSC v c nhim v lu gi tm thi s liu thu bao ca cc thu bao hin ang nm trong vng phc v ca MSC tng ng mc chnh xc hn HLR. Cc chc nng VLR thng c lin kt vi cc chc nng MSC.

1.3.1.4. AUC (Authentication Center):

Nhm bo v mng chng b s dng tri php bng cch s dng b ba RAND, SRES, Kc.

Nhng th tc m AUC thc hin to b 3 bao gm:

- To mt s ngu nhin RAND. - RAND v Ki cng vi thut ton A3 to ra s SRES (Signed Respone) v

to ra kho mt m Kc thng qua thut ton A8. - RAND, SRES v Kc c phn phi ti HLR

1.3.2. Phn h BSS (Base Station System):

C th ni BSS l mt h thng cc thit b c th ring cho cc tnh cht t ong v tuyn ca GSM. BSS giao din trc tip vi cc trm di ng (MS)


Trang 26

thng qua giao din v tuyn, v th n bao gm cc thit b pht v thu ng v tuyn v qun l cc chc nng ny. Mt khc BSS thc hin giao din vi cc tng i SS. Tm li BSS thc hin u ni cc MS vi nhng ngi s dng vin thng khc. BSS cng phi c iu khin v v vy n c u ni vi OSS.

Hnh 1.3.2.1: Cc giao din ngoi BSS.

Hnh 1.3.2.2: Cc phn t ca BSS

NSS: Mng v h thng con chuyn mch BSS: H thng con trm gc


Trang 27

OSS: H thng con khai thc MS: Trm di ng

1.3.2.1. BTS (Base Transceiver Station):

Mt BTS bao gm cc thit b thu pht, anten v x l tn hiu c th cho giao din v tuyn. C th coi BTS l cc modem v tuyn phc tp c thm mt s cc chc nng khc. Mt b phn quan trng ca BTS l TRAU (Transcoder and Rate Adapter Unit: khi chuyn i m v thch ng tc ). TRAU l thit b m qu trnh m ha v gi i m ting c th ring cho GSM c tin hnh. y cng thc hin thch ng tc trong trng hp truyn s liu. TRAU l mt b phn ca BTS, nhng cng c th t n cch xa BTS v thm ch trong nhiu trng hp c t gia cc BSC v MSC.

1.3.2.2. BSC (Base Station Controller):

BSC c nhim v qun l tt c giao din v tuyn ca BTS v MS thng qua cc lnh iu khin t xa. Cc lnh ny ch yu l cc lnh n nh, gii phng knh v tuyn v qun l chuyn giao (handover). Mt pha BSC c ni vi BTS cn pha kia ni vi MSC ca SS. Trong thc t BSC l mt tng i nh c kh nng tnh ton ng k. Mt BSC trung bnh c th qun l ti vi chc BTS ph thuc vo lu lng ca cc BTS ny. Giao din gia BSC vi MSC c gi l giao din A, cn giao din gia n vi BTS c gi l giao din Abis.

1.3.2.3. MS (Mobile Station):

Trm di ng l thit b duy nht m ngi s dng c th thng xuyn nhn thy ca h thng. MS c th l thit b t trong t, thit b xch tay hoc thit b cm tay. Loi thit b cm tay l thit b trm di ng ph bin nht. Ngoi vic cha cc chc nng v tuyn chung v x l cho giao din v tuyn MS cn phi cung cp cc giao din vi ngi s dng (nh: micro, loa, mn hin th, bn phm qun l cuc gi) hoc giao din vi mt s thit b khc (nh: giao din vi my tnh c nhn, fax). Hin nay ngi ta ang c gng sn xut cc thit b u cui gn nh u ni vi trm di ng. Vic la chn cc thit b u cui hin nay m cho cc nh sn xut, ta c th lit k ba chc nng chnh:

- Thit b u cui thc hin cc chc nng khng lin quan n mng GSM: Fax.


Trang 28

- Kt cui trm di ng thc hin cc chc nng lin quan n truyn dn giao din v tuyn.

- B thch ng u cui lm vic nh mt ca ni thng thit b u cui vi kt cui di ng. Cn s dng b thch ng u cui khi giao din ngoi trm di ng tun theo tiu chun ISDN, cn thit b u cui li c giao din u cui modem.

Hnh 1.3.2.3.1: Cu trc chc nng ca trm di ng.

1.3.3. Phn h khai thc v bo dng OSS:

Hnh 1.3.3.1: Cc phn t ca phn h OSS.

OSS thc hin ba chc nng chnh sau: - Khai thc v bo dng mng - Qun l thu bao v tnh cc - Qun l thit b di ng


Trang 29

1.3.3.1. Khai thc v bo dng:

Khai thc l cc hot ng cho php nh khai thc mng theo di hnh vi ca mng nh: ti ca h thng, mc chn, s lng chuyn giao (handover) gia 2 , nh vy nh khai thc c th gim st c ton b cht lng ca dch v m h cung cp cho khch hng v kp thi x l cc s c. Khai thc cng bao gm vic thay i cu hnh gim nhng vn xut hin thi im hin thi, chun b tng lu lng trong tng lai tng vng ph. Vic thay i mng c th thc hin mm qua bo hiu (chng hn thay i thng s handover thay i bin gii tng i gia 2 ), hoc thc hin cng i hi s can thip ti hin trng (chng hn b sung thm dung lng truyn dn hay lp t mt trm mi). h thng vin thng hin i khai thc c thc hin bng my tnh v c tp trung mt trm.

Bo dng c nhim v pht hin, nh v v sa cha cc s c, hng hc. N c mt s quan h vi khai thc. Cc thit b mng vin thng hin i c kh nng t pht hin mt s s c hay d bo s c thng qua t kim tra. Trong nhiu trng hp ngi ta d phng cho thit b khi c s c c th thay th bng thit b d phng. S thay th ny ch c th thc hin t ng, ngoi ra vic gim nh s c c th c ngi khc thc hin bng iu khin t xa. Bo dng cng bao gm cc hot ng ti hin trng nhm thay th thit b c s c.

1.3.3.2. Qun l thu bao:

Bao gm cc hot ng qun l ng k thu bao. Nhi m v u tin l nhp v xa thu bao khi mng. ng k thu bao cng c th rt phc tp bao gm nhiu dch v v cc tnh nng b sung. Nh khai thc c th thm nhp c tt c cc thng s ni trn. Mt nhim v quan trng khc ca khai thc l tnh cc cc cuc gi. Qun l thu bao mng GSM ch lin quan n HLR v mt s thit b OSS ring chng hn mng ni HLR vi cc thit b giao tip ngi my cc trung tm giao dch vi thu bao. Sim card cng ng vai tr nh mt b phn ca h thng qun l thu bao.

1.3.3.3. Qun l thit b di ng:

Qun l thit b di ng c b ng k nhn dng thit b EIR (Equipment Idnetity Register) thc hin. EIR lu gi tt c cc gi liu lin


Trang 30

quan n trm di ng MS. EIR c ni n MSC qua ng bo hiu kim tra s c php ca thit b.


Trang 31

Chng 2. RBS 2206 2.1. V tr v chc nng ca RBS trong mng GSM:

Trm gc v tuyn RBS bao gm cc thit b v tuyn v truyn dn. Ericsson cung cp 2 h RBS: RBS 200 v RBS 2000. Mi RBS hot ng trn 2 tn s, mt dng cho tn hiu pht ti MS v mt dng cho tn hiu nhn t MS.

2.1.1. V tr:

Hnh 2.2.1: V tr ca RBS trong mng GSM.

RBS giao tip vi BSC qua giao din A-BIS v giao tip vi MS qua giao din v tuyn.

2.1.1.1. Giao din A-BIS:

Chu trch nhim truyn dn lu lng v thng tin bo hiu gia BSC v RBS. Giao thc truyn dn c s dng cho vic truyn thng tin bo hiu l LAPD (Link Access Protocol on the D-Channel).


Trang 32

Hnh 2.2 2: Giao tip A-BIS gia RBS v BSC

2.1.1.2. Giao din v tuyn: - S dng k thut a thm nhp phn chia theo thi gian (TDMA) truyn -

nhn lu lng v thng tin bo hiu gia BTS v MS. K thut TDMA c dng chia mi tn s s dng thnh 8 khe thi gian, mi khe thi gian c n nh cho mt user. K thut ny cho php ti a 8 cuc m thoi trn mt tn s.!!!!!

- Tc bit: 270 kbit/s. - Bng thng: 200 KHz. - Khong cch song cng gia chiu xung v chiu ln trong mt knh l 45

MHz (GSM 900); 95 MHz (GSM 1800) v 80 MHz (GSM 1900).

Hnh 2.2.3: Giao tip v tuyn gia RBS v MS.


Trang 33

2.1.2. Chc nng ca RBS: - Ngun v tuyn : RBS kt ni ti MS qua khng gian bng vic thu pht sng

v tuyn, v chu s iu khin ca BSC. - nh cu hnh v khi ng h thng : nh cu hnh site cn c cc thng s

v lu lng v hot ng, cc thng s ny c u tin thit lp khi khi ng h thng gm : tn s thu pht, gii hn cng sut pht, s knh logic truyn trn knh vt l, BSIC cho mi trm.

- Truyn v tuyn : c thc hin trn knh vt l, cng sut pht c iu khin t BSC v thay i ty thuc vo khong cch t BTS ti MS. Cc thng tin h thng lun c pht vi cng sut ti a.

- Nhn tn hiu : RBS phi tch ng knh pht t MS. Trong thi gian gi, MS nh gi cht lng v mnh tn hiu, ng thi c lng thi gian tr ca tn hiu truyn v RBS ng vi knh cp. Cc tham s hiu chnh thi gian v kt qu o c gi v BSC x l.

- X l tn hiu : RBS x l tn hiu trc khi truyn v sau khi nhn gm: m ha bo mt, m ha knh, m ha thoi, xen k, cn bng, phn tp, iu ch, gii iu ch ...

- Truyn thng tin ng b: Thng tin ng b c truyn trn knh SCH v thng tin hiu chnh tn s c truyn trn knh FCCH; cho php MS ng b vi cu trc TDMA.

- iu kin cng sut trm gc: c thc hin gim thiu cng sut pht cho b thu pht ca RBS m vn gi c cht lng ca lin kt v tuyn.

- iu khin cng sut MS: nhm gim thiu cng sut pht ca MS m vn gi c cht lng ca knh v tuyn v gim nhiu ng knh gia cc user.

- o c knh truyn: RBS cung cp: Vic o c knh truyn theo ch tch cc: o c cht lng v cng

tn hiu trn knh ring chiu ln tch cc. Vic o c knh truyn theo ch ri: o c cng tn hiu trn

knh ring chiu ln ri. - Truyn gin on: l mt c cu cho php tt my pht v tuyn trong khi

khng c thoi hay d liu: Tit kim nng lng theo chiu ln ca MS. Gim nhiu ca mi trng. Gim cng sut tiu th ca RBS theo chiu xung.


Trang 34

- Mt m: RBS cung cp 2 phng thc: khng mt m hoc s dng thut ton mt m GSM. BSC s kim sot vic s dng cc phng thc ny.

- Nhy tn: ci thin cht lng truyn dn trn giao din v tuyn bng vic gim nhiu v fading a ng. C 2 loi nhy tn: Nhy tn bng gc: Mi my pht s pht mt tn s v d liu trn knh

vt l s c pht trn cc my pht khc nhau sau mi cm. Nhy tn tng hp: d liu trn knh vt l s c pht trn cng mt

my pht ti mi thi im nhng s thay i tn s pht sau mi cm. - Bo dng ti ch : RBS c th t vn hnh v bo dng khng cn s iu

khin t BSC. RBS c trang b cc n hin th trng thi v cnh bo, chi tit v li c th c iu khin bng my tnh qua phn mm giao tip OMT.

- Qun l ng bo hiu : RBS qun l ng bo hiu LAPD gia BSC v MS.

2.1.3. Kt lun:

Ti y, ta nm c s lc v mng di ng GSM cng nh v tr v chc nng ca thit b RBS ni chung trong mng GSM. By gi, ta tng kt li nhng c im chnh ca thit b: RBS giao tip vi BSC qua giao din A-bis v vi MS qua giao din v tuyn. Chc nng chnh ca RBS: ngun v tuyn; nh cu hnh v khi ng h thng; truyn, nhn v x l tn hiu. Trong phn tip theo, ta s nghin cu c th hn v h thit b RBS 2000.


Trang 35

2.2. H thit b RBS 2000 ca Ericsson: 2.2.1. Gii thiu:

H RBS 2000 l cc trm gc v tuyn th h th 2 ca Ericsson c pht trin h tr cc thng s k thut cho BTS trong h thng GSM

RBS 2000 c nhiu u im so vi RBS 200. H sn phm RBS 2000 trong h GSM ca Ericsson c thit k c bit cung cp kh nng vn hnh nhanh, hiu qu v chi ph thp. N cng cung cp kh nng lp t v cu hnh n gin vi cc thao tc kim tra v thc thi c bit. iu ny c th t c 1 cch d dng v cc t d4 c tch hp trc v phn mm th c ti v, v cng c kim tra trc khi cung cp cho khch hng.

RBS 2000 c thit k linh hot. Vic thit k linh hot ny c th hin qua vic c 1 h thng bao gm nhiu cc cu hnh v kh nng m rng. RBS c th c t cc v tr khc nhau nh ngoi tri hay trong nh, di t hay trn mi nh v c th treo trn tng.

K thut tch hp trn phm vi ln c th (VLSR) c p dng t c khong thi gian trung bnh di hn gia cc li.

K thut rt ngn thi gian sa cha (MTTR) c thc hin thng qua: - Giao din thn thin cho ngi s dng thng qua vic s dng cc ch th bng n v cc nt nhn thay cho ngn ng ca my trong vic d v cch ly cc li ca cc b phn trong thit b v ca cp - C th thay th v sa cha tng b phn trong thit b nh vic thit k theo tng module

RBS h tr k thut phn chia cu trc cell (HCS) vi 3 loi cu trc cell: cu trc ln dng trong cc vng ln hay nhiu vng gp li, cu trc nh dng trong cc vng nh v cu trc siu nh h tr trong nh. H thit b RBS 2000 h tr vic cu hnh a hng hay cu hnh r qut. H thit b RBS 2000 bao gm cc loi thit b:

- RBS 2101, RBS 2102, RBS 2103 - RBS 2202, RBS 2206 - RBS 2301/ 2302

2.2.2. Cu trc phn cng:

2.2.2.1. S kt ni cc RUs h thit b RBS 2000:


Trang 36

Hnh 2.2.4. S kt ni cc RU

H thit b RBS 2000 gm cc khi chc nng chnh : DXU, TRU, CDU, ECU, PSU. Chng lin lc vi nhau bng cc bus chc nng:

- Timing bus: mang thng tin nh thi t DXU phn phi ti cc TRU. - CDU bus: truyn thng tin gia TRU v CDU. - X-bus: truyn thng tin gia cc TRU phc v cho nhy tn bng gc.

- Local bus: chuyn thng tin gia DXU vi TRU, ECU

2.2.2.2. Cc khi chc nng chnh trong h thit b RBS 2000: A. Distribution Switch Unit - DXU:

DXU l b x l trung tm ca RBS. Mi RBS ch c mt DXU, trong cu hnh m rng th ch cn 1 DXU trn master cabinet a. Chc nng ca DXU: - Phn phi tn hiu ti cc TRU, v chuyn tip tn hiu ti RBS

khc. - To tn hiu nh thi cho RBS (dng thng tin ng b tch t

ng PCM hay ca ngun dao ng ni). - Tp hp ti ti a 16 cnh bo ngoi (ph thuc vo sn phm)


Trang 37

- Giao tip Local bus RS 485. - Giao tip PCM qua G.703 (gim st li ng truyn). - Giao tip OMT qua RS 232. - Qun l ngun ng truyn A-bis. - Tp hp cc ng iu khin (bo hiu LAPD ti BSC). - Lu tr phn mm cho ton b RBS. - Duy tr c s d liu v lp t (Installation Database (IDB)) c

tch hp vi DXU. IDB cha cc thng tin v cc phn cng c lp t, nh dng thit b, v tr v cc tham s v cu hnh.

DXU c th thit lp kt ni ti BSC (PCM link) v kt ni cho tng TS ti Transceiver. BSC iu khin DXU thng qua ng bo hiu LAPD.

b. Cc thnh phn chnh ca DXU:

Hnh 2.2.5: S khi DXU trong RBS 2000.

b.1. PCM part:

Mc ch ca PCM part l tch cc Time slots (TS) t ng A-bis v a ti cc TRU qua local bus. C th kt ni 2 ng PCM (Port


Trang 38

A/B) ti DXU. iu ny lm tng dung lng hoc cung cp mt d tha trn cc ng truyn.

b.2. CPU part:

B x l trung tm thc hin cc nhim v : - Qun l ti nguyn trong RBS. - Ti v v lu tr phn mm cho cc RU. - Giao tip vi OMT. - Vn hnh v bo dng. - Cnh bo trong v ngoi. - Tch thng tin bo hiu LAPD.

b.3. CTU part:

B nh thi trung tm to ra cc xung chun n nh cho cc TRU. B nh thi c th c ng b t ng A-bis hay t b dao ng ni 5 Mhz.

b.4. HDLC Concentrator (LAPD Concentration) :

HDLC Concentration c th ghp ti 4 TS bo hiu LAPD vo mt TS khi truyn v ngc li lc nhn nhm lm tng dung lng thoi cho cc ng PCM. HDLC Concentration c cc thng tin v knh iu khin v phn phi ti cc TRU v CPU part (ca DXU) tng ng.

Ghp knh LAPD ngha l cc ng bo hiu A-bis LAPD v ng lu lng c ghp li thnh 1 ng 64 kbps. Ch c 2 PCM TS trn 1 TRU l cn thit v c ch li cho cc site t TRU.

b.5. TGSync:

Giao din TGSync/ESB (External Synchronization Bus) c s dng truyn tn hiu ng b v nh thi gia hai hay nhiu RBS.

B. Transceiver Unit - TRU:

TRU l mt b phn thu pht v x l tn hiu thu v pht t trm ti MS. C nhiu loi TRU ph hp cho tng gii tn. Mt TRU c th phc v cho 8 knh truyn ton tc song cng (full rate duplex), hay 16 knh bn tc (half rate).

Mi TRU c 1 ng pht v hai ng thu (phn tp).


Trang 39

a. Chc nng ca TRU: - Pht: iu ch GMSK, to tn s cao tn RF, khuych i cng sut - Thu: Nhy tn bng gc hay nhy tn tng hp (Basebands

hopping/synthesizer hopping). - Phn tp: X l tn hiu v tuyn, qun l TRX

b. Cc thnh phn chnh ca TRU:

Hnh 2.2.5: S khi TRU trong RBS 2000. b.1. Digital Block (TRUD):

Hot ng nh b iu khin TRX. N lin lc vi cc phn khc trong RBS thng qua Local bus, CDU bus, Timing bus, v X bus. Digital Block thc hin cc qu trnh x l tn hiu Uplink v Downlink nh : m ha knh, ghp xen, bo mt, nh dng burst v cn bng.

b.2. Transmitter Block (TX-block):

Thc hin cc chc nng pht gm : iu ch GMSK, to tn hiu cao tn RF, khuych i cng sut. Khi thc hin nhy tn bng gc (Baseband hoping) mi b pht s truyn tn hiu trn cng mt tn s v d liu knh vt l s c truyn t cc TX khc nhau ng vi mi burst. Trong nhy tn tng hp (Synthesiser hopping)


Trang 40

th d liu knh vt l lun c gi cng TX nhng s s dng tn s mi cho mi burst.

b.3. Receiver Block (RX-block):

Khi nhn thc hin vic tip nhn v gii iu ch. C hai RX trn mi TRU. Phn thu c kh nng nhy tn.

Khi kt ni loop TX v RX ta c th kim tra TRU thng qua vic to tn hiu kim tra.

C. Combining and Distribution Unit - CDU:

a. Chc nng ca CDU:

CDU l giao din gia cc TRU v h thng anten. CDU cho php nhiu TRU cng s dng chung mt anten. Cc loi CDU khc nhau c s dng cho cc loi anten khc nhau.

b. Cc thnh phn chnh ca CDU:

Hnh 2.2.5: Cc thnh phn chnh ca CDU trong h thit b RBS 2000.

b.1. Combiner:

Kt hp mt s ng ra truyn ln mt anten. Nhiu combiner c th c s dng kt hp hai nhm my pht.

- Hybrid Combiner: L thit b bng rng cho php mi tn s trong bng tn ca my pht i qua theo chiu pht vi suy hao ghp l 3 dB. Mi b Hybrid combiner c th ghp 2 my pht to thnh 1 ng ra trn cng mt anten.


Trang 41

Hnh 2.2.6: Hybrid Combiner

- Filter Combiner: l thit b bng hp cho php ch mt tn s trong di tn my pht i qua vi suy hao ghp l 4 dB.

Hnh 2.2.7: Filter Combiner b.2. RXDA (Receiver (RX) Divider Amplifier):

Chia tn hiu nhn c thnh nhiu mch c lp, do cho php nhiu b thu cng nhn c tn hiu t mt anten.

b.3. Duplexer:

Cho php mt tn hiu truyn i qua mt anten v ng thi cho php nhiu tn hiu nhn qua cng mt anten ti b thu.

b.4. RF filter:

y l mt b lc thng di (BF), cho tn hiu qua trong di tn mong mun, loi b tn hiu khng mong mun. N c gn c vo u thu v u pht, tn hiu thu c lc trc khi x l v tn hiu pht cng c lc trc khi pht ln anten.


Trang 42

c. Cc loi CDU:

C nhiu loi CDU khc nhau ph thuc vo s la chn ca ngi s dng nh chi ph, dung lng, s lng anten. - CDU - A : c th iu khin 1 - 2 TRU, dng cho cc cell dung lng thp v vng ph sng rng. - CDU - C v CDU - C+ : c th iu khin 1 - 2 TRU v c th lin kt iu khin ti 6 TRU. y c xem l mt gii php lm gim s lng anten cn dng so vi CDU - A. - CDU - D : c th iu khin t 1 - 6 TRU. CDU - D c th c kt ni iu khin ti 12 TRU vi dung lng cao v l gii php lm gim s lng anten so vi CDU - C v CDU - C+.

c.1. CDU - A:

Hnh 2.2.8: S khi CDU-A trong RBS 2000.

- CDU - A cha hai RXDA, chng c s dng giao tip vi hai anten ring bit cho mc tiu phn tp. - CDU - A khng c combiner nn khng th pht cng lc nhiu tn hiu trn cng mt anten. - CDU - A bng tn 900 Mhz c hai duplexer bn trong cho php va thu v pht trn cng mt anten, gip gim s lng anten trong cu hnh. - CDU - A bng tn 1800/1900 Mhz khng c duplexer bn trong do vy cn nhiu feeder anten ring bit cho vic thu pht tn hiu trong c hai ng tn hiu A v B.


Trang 43

c.2. CDU loi C v C+: - CDU - C cha mt RXDA phn chia tn hiu nhn c t mt anten

ti 6 TRU, cn c hai CDU - C ci thin cht lng tn hiu thu (phn tp).

- Mt CDU kt ni hai ng truyn ti mt anten. - Khi s dng trong mt cabinet c 5 hoc 6 TRU (1cell) th cn dng 3

CDU - C . Hai CDU - C u cung cp cc tn hiu thu cho tt c cc TRU, CDU - C cn li dng kt ni b pht th nm vi th su.

- CDU - C dng bng tn 900 Mhz c b Hybrid Combiner cho php hai b transmitter pht tn hiu trn cng mt anten, loi ny c duplexer gip gim s lng anten cn dng.

- CDU - C+ tng thch vi CDU - C, nhng ch c mt kiu cho mi bng tn 900/1800/1900 Mhz. Phn thu ca CDU - C+ dng hai anten thu v c thm mt ng dn ph, nn mt CDU - C+ c th phn tp cho hai TRU v mi CDU - C+ c th hot ng c lp vi cc CDU - C+ khc.

Hnh 2.2.9: S khi CDU-C trong RBS 2000.

c.3. CDU - D:


Trang 44

Hnh 2.2.10: S khi CDU-D trong RBS 2000.

- CDU - D c kch thc vt l gp 3 ln CDU - A, C hay C+, v lp y mt ngn.

- CDU - D gm cc phn chnh sau : Distribution Unit - DU : quan trng nht trong CDU - D, n x l

cc ng dn A v B ti cc TRU. Combiner Unit - CU : kt hp hai tn hiu truyn ti bus RF, CDU -

D c th ghp 1-3 CU. Filter Unit - FU : b lc a tn hiu t CU ti anten pht v chuyn

tn hiu thu t anten ti DU. FU c duplexer gi l FUd. Vi bng tn 900 Mhz ch c FUd, bng tn 1800/1900 Mhz c c FU v FUd. Vic c s dng duplexer hay khng l ty .

D. Energy Control Unit - ECU:

ECU iu khin v gim st cc thit b cp ngun (PSU, BFU, thit b kt ni AC), v cc thit b iu khin nhit (qut, my sy, my lnh, b trao i nhit). ECU cng gim st cc thi t b cnh bo t ngun v h thng theo di nhit . Mc ch ca ECU l bo v thit b trong RBS khi nhng nh hng ca mi trng lm gim tui th v tin cy. ECU bo v thit b trong iu kin mt ngun hay khi ng khi nhit thp.

Chc nng ca ECU: - iu khin cc thit b cp ngun PSUs, BFUs, accu, v cc thit

b lm mt : qut, my sy, my lnh, b trao i nhit. - Khi ng lnh RBS trong phm vi cho php. - Tch v x l cnh bo t cc thit b gim st.


Trang 45

- X l cc tn hiu cm bin tng t. - Truyn thng vi DXU qua local bus. - Gnh ti vi PSU (ch PSU 230). - Duy tr in p h thng trnh accu b qu nhit. (ch PSU 230).

E. Power Supply Unit PSU:

PSU s chuyn i ngun in cung cp thnh in p +24 VDC cho h thng hot ng. Cc PSU c t song song vi nhau v phi lun lun c cu hnh bo v N+1. PSU iu khin v gim st ngun thng qua cp ESP.

Ch , khi s dng ngun c qui d phng, mt PSU b sung c dng np in cho cc c qui. Nu RBS c cu hnh vi PSU d phng th khng c PSU b sung cho vic np c quy.

F. Internal Distribution Module IDM: IDM c nhim v cung cp in p +24VDC n cc b phn khc

trong Cabinet. C mt u ni cho kt ni gia ESD v cc thit b in trong IDM.

2.2.3. Kt lun:

Ti y, ta n m v cu trc v chc nng ca cc khi phn cng bn trong v ngoi t ca h thit b RBS 2000 ca Ericsson. y l nhng nn tng, c s chng ta bc vo phn tip theo (tm hiu v thit b RBS 2206) c d dng hn.


Trang 46

2.3. Thit b RBS 2206 ca Ericsson:

2.3.1. Gii thiu:

Hnh 2.2.11: T RBS 2206.

- RBS 2206 l thit b mi ca h thit b RBS 2000 ca Ericsson. RBS 2206 c th vn hnh v hot ng chung vi cc thit b RBS khc trong h RBS 200 hoc RBS 2000.

- Trng lng t lp y: 230 Kg. - Kch thc:

Chiu ngang Chiu rng Chiu cao Cabinet bao gm khung (mm) 600 400 1850 Cabinet (mm) 600 400 1800 Khung (mm) 600 400 50

Bng 1: Cc thng s v t RBS 2206

- Ngun cung cp:-(48/60) VDC; +24 VDC; 120-250 VAC. - u im ca RBS 2206 l vi cng kch thc Cabinet RBS 2202 nhng c

th tng gp i v s lng transceiver v cc kt ni do RBS 2206 h tr ln n 6 dTRU tng ng vi 12 Transceiver cho mi Cabinet.

- RBS 2206 c hai kiu kt ni mi rt uyn chuyn hot ng cho 1, 2 hoc 3 sector vi hai bng tn GSM 900/1800 trn cng mt cabinet. V d, ta c th cu hnh kt ni CDU-F l 3x4, 2x6 v 1x12 trn 1 cabinet. Cn i vi cu hnh kt ni CDU-G, ta c 2 loi : capacity mode v coverage mode, 2


Trang 47

loi kt ni ny c th thay i linh hot. Nu ta s dng coverage mode CDU-G, th cng sut pht i s tng ln 3.5dB.

2.3.2. Cc thnh phn chnh trong t RBS 2206:

RBS 2206 bao gm cc card sau: - Khi cp ngun (PSU) - Module phn phi (IDM) - Khi thu pht (dTRU) - Khi chuyn mch phn phi (DXU) - Khi chuyn mch cu hnh (CXU) - Khi kt ni v phn phi (CDU) - Khi kt ni ngun (ACCU/DCCU) - B lc DC - B iu khin qut FCU

Hnh 2.2.12: V tr cc khi chc nng trong t RBS 2206.

2.3.2.1. Power Supply Unit PSU:

PSU s chuyn i ngun in cung cp thnh in p +24 VDC cho h thng hot ng. Cc PSU c t song song vi nhau v phi lun lun c cu hnh bo v N+1. PSU iu khin v gim st ngun thng qua cp ESP.


Trang 48

Ch , khi s dng ngun c qui d phng, mt PSU b sung c dng np in cho cc c qui. Nu RBS c cu hnh vi PSU d phng th khng c PSU b sung cho vic np c quy.

RBS 2206 c trang b bo v tm thi c gii hn; v vy theo khuyn co, ta nn s dng b trit t bin in th v b chng st.

Hnh 2.2.13: Khi PSU trong RBS 2206.

2.3.2.2. Internal Distribution Module IDM:

IDM c nhim v cung cp in p +24VDC n cc b phn khc trong Cabinet. C mt u ni cho kt ni gia ESD v cc thit b in trong IDM.


Trang 49

Hnh 2.2.14: Module IDM trong RBS 2206.

2.3.2.3. Double Transceiver Unit dTRU:

Hnh 2.2.15: Khi dTRU trong RBS 2206.

dTRU l mt b phn c th thay th c, gm 2 my thu pht khc nhau. RBS 2206 c th h tr 6 dTRU trong cng mt cabinet. V vy RBS 2206 c th ln n 12 b thu pht trong cng mt cabinet.

dTRU c nhiu version khc nhau, ph thuc vo di tn s. Tuy nhin tt c u c th h tr c trong mng GPRS. dTRU h tr nhiu chun m ha khc nhau, thng thng A5/1 hoc A5/2. Nhng loi m ha ny c iu khin thng qua phn mm.

Trong dTRU b ghp Hybrid c s dng vi CDU-G tng s lng b thu pht TRX trn mi anten. Tuy nhin ta cng c th cu hnh b qua chc nng ny bng cch dng dy cp kt ni ti pha trc ca dTRU.


Trang 50

2.3.2.4. Distribution Switch Unit DXU:

Hnh 2.2.16: Khi DXU trong RBS 2206.

DXU cung cp hai loi kt ni d liu 2Mbit/s hoc 1.5 Mbit/s v c th kt ni cho tng khe thi gian (time slots) n cc TRU. DXU cng c th ly c tn hiu ng b t lung PCM v to tham chiu nh thi cho RBS.

DXU cng h tr LAPD Multiplexing, LAPD Concentration v Multi Drop. Thit b RBS 2206 ch bao gm mt DXU-21 cho mi cabinet v c cc c im sau: Cung cp 4 port truyn (E1/T1). L phn cng c chun b h tr cc chc nng ca EDGE, ln ti 12

my thu pht. Cung cp mng v tuyn ng b nhm to giao tip ti mt b thu GPS

bn ngoi. Cung cp chc nng nh v di ng nhm to giao tip ti mt LMU bn

ngoi. C mt Flashcard c th tho ri, cho php ti c s d liu (IDB) mt

cch nhanh chng v n gin. H tr mng bus LAN vi O&M bn ngoi. H tr ng b nhm thu pht TG. Mang chc nng ECU. Cho php thc hin vi mng chuyn mch gi (BSS IP) v cc chc nng

ca PCU nn RBS 2206 cng c s dng trong GPRS v EGPRS.

2.3.2.5. Configuration Switch Unit CXU:

Nhim v chnh ca CXU l kt ni cho gia CDU v dTRU trong hng v. CXU c th m rng hoc cu hnh li cabinet vi s di di hoc thay i cp RX l ti thiu.


Trang 51

Ng vo/ra RX trn dTRU v CDU c t v tr sao cho t tn cp nht khi kt ni CXU vi dTRU/CDU.

Hnh 2.2.17: Khi CXU trong RBS 2206.

2.3.2.6. Combining and Distribution Unit CDU:

Hnh 2.2.18: CDU-G v CDU-F trong RBS 2206.

CDU c nhim v kt ni nhng tn hiu truyn i t b thu pht v phn phi tn hiu nhn c. B lc song hng s t trong CDU. CDU cn cho php o c t s sng ng (VSWR- voltage standing wave ratio) theo hng ti hoc phn x. C 2 loi CDU c s dng trong tt c cc cu hnh: i vi Hybrid Combiner, s dng CDU-G, cho php nhy tn bng gc

v nhy tn tng hp. i vi Filter Combiner cho nhng cu hnh ln hn, s dng CDU-F,

cho php nhy tn bng gc. CDU-F ti u trong cu hnh v cng sut pht ln trn mt s lng nh Anten.

B lc song hng cho php c hai hng thu v nhn kt ni n cng mt anten. Cu hnh song h ng cn cho php ti thiu ha s lng feeder v anten s dng cng nh gim thiu c suy hao ghp trn ng truyn.

C hai cu hnh CDU-G v CDU-F u c th h tr cho EDGE.

a. CDU-G:

Cc c im chnh ca CDU-G:


Trang 52

C th ln n 4 TRX trn 2 anten hoc mt anten lng cc. Khng gii hn v bng tn. Khong cch knh tn s gim xung 400 KHz. H tr nhy tn bng gc v nhy tn tng hp. C hoc khng c b ghp Hybrid (trong dTRU):

- C b ghp Hybrid: Ti a 12 TRx trong 1 cabinet c dng. - Khng c b Hybrid: Ti a 6 TRx trong 1 cabinet c dng.

CDU-G c chun b cung cp 8 TRx trn 1 CDU bng cch s dng b ghp Hybrid ph theo hng pht gia dTRU v CDU-G.

b. CDU-F:

Cc c im chnh ca CDU-F: CDU-F c thit k c th cho php nhiu TRX trn 1 anten. Mt CDU-F c cng kch thc vt l so vi CDU-G. H tr nhy tn bng gc. Khong cch tn s gim xung 400 KHz. H tr cc cu hnh 1, 2 hoc 3 sector cho mt t RBS 2206. H tr 2 di tn 900 v 1800 MHz.

2.3.2.7. AC Connection Unit/DC Connection Unit - ACCU/DCCU v DC Filter:

ACCU/DCCU c nhim v phn phi hoc chuyn tip in p cung cp 120-250 VAC (ACCU) hoc -48/-60 VDC (DCCU) n cc PSU.

B lc DC c nhim v kt ni ngun cung cp +24VDC vi c qui d phng.

c qui d phng c th hot ng c vi ngun cung cp 120-250 VAC.


Trang 53

Hnh 2.2.19: Khi ACCU trong RBS 2206.

2.3.2.8. Fan Control Unit FCU:

Hnh 2.2.20: B iu khin qut trong RBS 2206.

FCU s iu khin tt c cc qut trong cabinet bo m nhit trong cabinet. B phn gim st nhit c iu khin bi DXU thng qua FCU vi s gip ca b d nhit c t bn trong cc RU.

2.3.3. Cc kt ni RF:

Trong phn ny chng ta s nghin cu cc kt ni gia cc CDU, CXU, dTRU v ASU trong t RBS 2206. Cc ng cp trong t c nhm li thnh tng b vi cc chc nng sau: Cp EPC EPC gia PSU, FCU, DXU v BFU.


Trang 54

Ngun: tt c cc ng cp lin quan n ngun vo. CDU: tt c cc ng cp lin quan n dTRU, CXU v CDU.

2.3.3.1. Kt ni CDU-G: a. S kt ni:

Hnh 2.2.21: Kt ni CDU-G vi 2 dTRU trong mi sector trong RBS 2206.


Trang 55

b. Kt ni gia CDU-G v dTRU:

b.1. C v khng c b ghp Hybrid:

Hnh 2.2.22: Kt ni gia CDU-G v dTRU (c b ghp hybrid) - RBS 2206.


Trang 56

Hnh 2.2.23: Kt ni gia CDU-G v dTRU (khng c b ghp Hybrid)-

RBS 2206.

b.2. Cu hnh 1+1+2:


Trang 57

Hnh 2.2.23: Kt ni gia CDU-G v dTRU theo cu hnh 1+1+2 - RBS

2206.

2.3.3.2. Kt ni CDU-F:

a. S kt ni:


Trang 58

Hnh 2.2.24: S kt ni CDU-F vi 6 dTRU trn 1 sector trong RBS

2206.

b. Kt ni gia CDU-F vi dTRU:


Trang 59

Hnh 2.2.25: Kt ni CDU-F vi dTRU trong RBS 2206.

c. Kt ni gia cc CDU-F:

Hnh 2.2.26: Kt ni gia cc CDU-F trong RBS 2206.

2.3.3.3. Kt ni cp ASU:


Trang 60

Hnh 2.2.27: Cc cng kt ni trn ASU trong RBS 2206.

Hnh 2.2.28: Kt ni cp ASU trong RBS 2206.

ASU yu cu cung cp ngun v kt ni n cc anten, cc CDU v CXU. Tt c cc cng c t trn mt trc ca ASU. C 18 cng, chia thnh 3 nhm, mi nhm gm 6 cng.


Trang 61

Bng 2: Chc nng cc cng trn ASU trong RBS 2206.

2.3.4. Cc cu hnh cho thit b RBS 2206:

2.3.4.1. Kt ni vi Anten:


Trang 62

Hnh 2.2.29:Kt ni cp gia ASU v u ni chia s anten trong RBS 2206.

Trong phn ny, chng ta s cp n vic ni cp t anten ti ASU. Cc cp RF gia CDU v cc TRU c lin quan c chun ha v khng thay i.

2.3.4.2. Cu hnh vi CDU-F:

a. Kt ni vi anten:

Ng kt ni vi anten nm pha trn ca cng CDU.


Trang 63

Hnh 2.2.30: Ng kt ni vi Anten ca CDU-F trong RBS 2206.

b. Cc cu hnh:

b.1. Cu hnh 3x2 v 3x4:

Hnh 2.2.31: Cu hnh 3x2 v 3x4 CDU-F c v khng c TMA trong RBS

2206.


Trang 64

Bng 3: Yu cu ca cu hnh 3x2 v 3x4 CDU-F trong RBS 2206.

T hnh v, ta thy rng cc cu hnh sau y c th thc hin c: 1x2, 2x2, 1x4 v 2x4.

b.2. Cu hnh 1x8:

Hnh 2.2.32 Cu hnh 1x8 CDU-F c v khng c TMA trong RBS 2206.

Bng 4: Yu cu vi cu hnh 1x8 CDU-F trong RBS 2206.


Trang 65

b.3. Cu hnh 1x12:

Hnh 2.2.33: Cu hnh 1x12 CDU-F c v khng c TMA trong RBS 2206.

Bng 5: Yu cu cho cu hnh 1x12 CDU-F trong RBS 2206.

b.4. Cu hnh 2x6:

Hnh 2.2.34: Cu hnh 2x6 CDU-F c v khng c TMA trong RBS 2206.


Trang 66

Bng 6: Yu cu vi cu hnh 2x6 CDU-F trong RBS 2206.

b.5. Cu hnh 1x4 + 1x8:

Hnh 2.2.35: Cu hnh 1x4 + 1x8 CDU-F c v khng c TMA trong

RBS2206.

Bng 7: Yu cu vi cu hnh 1x4 + 1x8 CDU-F trong RBS 2206.


Trang 67

b.6. Cu hnh: 1x8 + 1x4:

Hnh 2.2.36: Cu hnh 1x8 + 1x4 CDU-F c v khng c TMA trong RBS

2206.

Bng 8: Yu cu cho cu hnh 1x8 + 1x4 CDU-F trong RBS 2206.

2.3.4.3. Cu hnh vi CDU-G:

a. Kt ni vi Anten:

Ng kt ni vi anten nm pha trn ca cng CDU.

Hnh 2.2.37:Ng kt ni vi anten ca CDU-G trong RBS 2206.


Trang 68

b. Cc cu hnh:

b.1. Cu hnh 3x2 v 3x4:

Hnh 2.2.38: Cu hnh 3x2 v 3x4 CDU-G c v khng c TMA trong RBS

2206.

Bng 1: Yu cu cho cu hnh 3x2 v 3x4 CDU-G trong RBS 2206.

T cu hnh trn, ta c th thc hin c mt s cu hnh khc nh: 1x2, 2x2, 1x4 v 2x4.

b.2. Cu hnh 1x8:


Trang 69

Hnh 2.2.39: Cu hnh 1x8 CDU-G c v khng c TMA trong RBS 2206.

Bng 10: Yu cu cho cu hnh 1x8 CDU-G trong RBS 2206.

b.3. Cu hnh 1x12:


Trang 70



b.4. Cu hnh 2x6:



Trang 71


2.3.5. Thay i cu hnh, tng gim nhm thu pht:

Trong phn ny chng ta s m t nhng cu hnh khc nhau vi ng b nhm thu pht v cch kt ni cp ESB (External Synchronization Bus).

Nu cu hnh ang tn ti khng c m rng y th chng ta c th thay i cu hnh bng cch thm vo cc thnh phn sau y: Thm cabinet mi. Thm dTRU. Thm CDU.

Cu hnh cng c th thay i bng cch tho g cc phn t trn.

Trong phn ny chng ta m t nhng cu hnh khc nhau ca TG, v cch kt ni cp ESB gia hai cabinet RBS 2206. ng b TG l cng ngh s dng m rng thm mt cabinet RBS 2206 trong cng mt cell. Vic ng b c thc hin bng cch thay i thng s v thi gian thng qua cp ESB.

2.3.5.1. Cu hnh vi ng b TG:

Chng ta s a ra mt s v d v cc cu hnh vi ng b TG. Phn ghch cho trong cc hnh v th hin CDU v TRU no kt hp vi nhau:

Hnh 2.2.42: Kt hp 2 RBS 2206 vi CDU-F n bng.


Trang 72

Hnh 2.2.43:Kt hp 2 RBS 2206 vi CDU-G n bng.

Hnh 2.2.44: M rng RBS 2202 vi 1 RBS 2206.

a. RBS 2202 CDU-C+ v RBS 2206 CDU-G

b. RBS 2202 CDU-D v RBS 2206 CDU-F.

2.3.5.2. Kt ni cp ESB:

Cp ESB dng kt ni gia cc cabinet v c th cu hnh m rng nhiu hn mt cabinet.

(b) (a)


Trang 73

Hnh 2.2.45: Kt ni cp ESB.

2.3.5.3. Tng gim nhm thu pht:

a. Tho g RU:

Trong phn ny chng ta s tm hiu cch tho g CDU, TRU

a1. Tho g CDU:

- Nhn nt Local/ remote trn cc TRU m kt ni vi CDU cn tho g. n ch th mode Local s chp sng lin tc

- i cho ti khi cc n ch th RF tt ht v n ch th mode Local c mu vng, cho thy rng cc TRU ch Local

- Tt thit b ngt in tng ng vi CDU cn tho g

- Nu c Bias Injectot th tho g Bias Injector ni vi CDU

Nu khng c Bias Injector th tho g cp feeder anten

- Tho tt c cc cp ni vi CDU

- Tho g CDU

- Sau khi vic tho g hon tt, thc hin nh tuyn li cho mng (phn ny s c tm hiu r trong phn sau)

a2. Tho g TRU:

- Nhn nt Local/ remote trn TRU cn tho g. n ch th mode Local s chp sng lin tc

- i cho ti khi cc n ch th RF tt ht v n ch th mode Local c mu vng, cho thy rng TRU ch Local

- Tt thit b ngt in tng ng vi TRU cn tho g trn IDM


Trang 74

- Tho tt c cc cp ni vi TRU

- Tho g TRU

- Sau khi vic tho g hon tt, thc hin nh tuyn li cho mng (phn ny s c tm hiu r trong phn sau)

b. Thm RU:

b1. Thm CDU:

- Chc chn rng tt c cc TRU s kt ni vi CDU mi u ch Local, c th hin qua vic cc n ch th Local mode trn cc TRU u c mu vng

Nu cc TRU khng ch th ta nhn nt Local mode trn cc TRU . n Local mode s chp sng, sau n ch th Local mode v RF s c mu vng

- Gn CDU

- Gn Bias Injector

- Nu cp feeder anten cha c gn th tin hnh gn cp feeder

- Kt ni tt c cc cp

- Bt thit b ngt tng ng vi CDU

- Sau khi vic thm CDU hon tt, thc hin nh tuyn li cho mng (phn ny s c tm hiu r trong phn sau)

b2. Thm TRU:

- Chc chn rng thit b ngt tng ng vi TRU cn thm vo trn IDM th c tt

- Gn thm TRU mi

- Ni tt c cc cp

- Bt thit b ngt tng ng vi TRU cn thm vo trn IDM

- Sau khi vic thm TRU hon tt, thc hin nh tuyn li cho mng (phn ny s c tm hiu r trong phn sau)

c. nh tuyn li sau khi tng/gim nhm thu pht:


Trang 75

- Cu hnh v cp nht li IDB da trn cu hnh mi

- Kim tra n ch th hot ng c mu xanh. Nu khng, nhn nt Local/Remote trn cc TRU. Cc ch th Local mode s chp sng khi cc TRU tt ch remote

2.3.6. Kt lun:

Ti y, chng ta cng n m r v thit b RBS 2206 ca Ericsson. V y cng l thnh vin ca h RBS 2000 nn c mt s c im chung m ta bit r khi tm hiu h thit b RBS 2000 nn ti khng cp li trong phn ny. So vi RBS 2202, RBS 2206 c mt s u im: Mt s c im RF mi v mnh hn. Gim khong cch knh vi cu hnh c filter combiner. Cng sut pht tt hn. Kch thc dTRU bng vi kch thc TRU trong RBS 2202 nhng c

dung lng gp i.


Trang 76

Chng 3. RBS 2216 v RBS 2116 3.1 Thit b RBS 2216 ca Ericsson: 3.1.1. Gii thiu:

T RBS 2216 ca Ericsson

- RBS 2216 l thnh vin trong h RBS 2000 v c s dng trong nh (Indoor), RBS 2216 l trm gc c dung lng cao, vi 12 TRX v ln ti 6 DRU (Double Radio Units).

- Kch thc t: Dng t n : 950 x 600 x 400 (mm3). Dng xp chng: 1850 x 600 x 400 (mm3).

- Ngun cung cp: 200-250 VAC, -48 VDC v +24 VDC (khng s dng DCCU v PSU.

- Trng lng t lp nay: 186.6 Kg

- Trng lng : 7.6 Kg.

- C th cng hot ng chung hay thay th cho RBS 200/205.

- S dng cc b phn ri nh cc RBS khc trong h Macro RBS 2000.

- c thit k cho hu ht cc h thng in p thng dng.


Trang 77

- gim kch thc t, tt c cc thit b truyn dn v ngun pin c lp bn ngoi t. Bn trong Cabinet ch cha cc thit b v tuyn, thit b cp ngun v thit b lm mt.

- Cc t im ca ca RBS 2216: 1, 2, hoc 3 sectors trong 1 t. Dng chung anten vi h thng GSM, TDMA, hoc WCDMA. Truyn dn gin on. B lc song cng. H tr Enhanced Data rate for Global Evolution (EDGE) Cnh bo ngoi. Nhy tn Built-in bias Injector Tp hp v dn knh Link Access Procedures on D-Channel (LAPD) lm

cho ti nguyn truyn dn c s dng hiu qu hn. ng b GPS H tr cc cu hnh P-GSM 900, E-GSM 900 v GSM 1800. Phn tp thu. C th s dng cc gioa tip truyn dn sau:

T1 1544 Kbps, 100 E1 2048 Kbps, 75 E1 2048 Kbps, 120

- Cc thit b ty chn: Accu d phng Distribution Frame (DF) Dual-Duplex Tower-Mounted Amplifier (ddTMA) External Synchronization Bus (ESB) Redundant PSU Receiver (RX) Splitter Tower-Mounted Amplifier Control Module (TMA-CM) Transmission Adapter (TA), 75 - 120


Trang 78

3.1.2. Cc khi chc nng phn cng ca RBS 2216: 3.1.2.1. Cc khi chc nng chun:

Cc khi chc nng chun ca RBS 2216

3.1.2.1.1. DRU : DRU iu khin s truyn v nhn tn hiu v tuyn. DRU kt ni b thu pht

v h thng anten. DRU c th c cu hnh kt hp hoc ring l. C t 1-6 DRU trong 1 t.


Trang 79

DRU

DRU l giao tip gia Y-Link n t DXU v h thng anten. DRU bao gm 2 b thu pht, 1 b kt hp v phn phi, v 1 b lc. Giao tip DRU h tr c 2 dng iu ch GMSK (GSM) v 8-PSK (EDGE).

DRU c mt b lai dng kt hp 2 b pht thnh 1 b. Mi b pht khi kt ni vi Tower-Mounted Amplifier Control Mudule (TMA-CM) c th cung cp in cho TMA.

M t chc nng ca DRU:


Trang 80

S khi DRU

DRU bao gm cc khi chc nng chnh: H thng x l trung tm (CPU) H thng x l tn hiu s (DSP) H thng iu khin v tuyn H thng v tuyn H thng kt hp v phn phi H thng lc

CPU System:


Trang 81

H thng CPU iu khin RBS bao gm 1 CPU h tr x l logic v b nh c tc dng kim sot cc giao tip.

DSP System: Hai h thng DSP thc hin tt c cc x l tn hiu bng gc cn thit cho 1 TRX.

Radio Control System: C hai h thng iu khin v tuyn m nhim cc chc nng nh sau:

ng b v iu khin cc phn khc nhau ca h thng v tuyn. iu ch v chuyn i D/A cho tn hiu pht. B lc chn knh i vi tn hiu thu. Cn bng tr v li cho tn hiu thu pht.

Radio System: Mi h thng radio cha 2 b thu v 1 b pht bao gm c b khuye61ch i

cng sut. B thu nhn tn hiu cao tn ng ln c i

Tai lieu thiet bi 2G.pdf

Documents

Transcript of Tai lieu thiet bi 2G.pdf