Upload
noilalam
View
219
Download
0
Embed Size (px)
Citation preview
8/8/2019 Slide GSM.03std
1/52
Trng i hc Bch Khoa H Ni
Khoa in t Vin thng
Thng tin di ngMobile Communications
TS. Trng TunB mn K thut thng tin
H Ni, 8-2010
8/8/2019 Slide GSM.03std
2/52
CHNG 2
H thng GSM
1. Cu trc mng GSM
8/8/2019 Slide GSM.03std
3/52
GSM
Groupe Special Mobile , Global System for Mobile
Bt u nghin cu chun ha vo nm 1982.
Mc tiu cho php thu bao lu ng ( roaming ) khp
chu u.
Chnh thc cung cp dch v nm 1991
a truy nhp TDMA/FDMA (8 thu bao / 200KHz)
Bng tn GSM 900 MHz; sau m rng sang bng tn
DCS 1800MHz v PCS 1900 MHz. Ngy nay, GSM tr thnh chun ton cu.
Cc giao din c chun ha;
My thu GSM ba bng tn c th lu ng ton cu.
8/8/2019 Slide GSM.03std
4/52
GSM PLMN - Public Land Mobile Network
Mng thng tin di ng mt t cng cngPLMN theo chun GSM c chia thnh
3 (4) phn h: Phn h chuyn mch - NSS
Network Switching Subsystem.
Phn h v tuyn - RSS = BSS + MS Radio SubSystem
Phn h vn hnh v bo dng - OMS
Operation and Maintenance Subsystem
8/8/2019 Slide GSM.03std
5/52
CU TRC MNG PLMN - GSM
Kt ni mang thng tin bo hiu /iu khin Kt ni mang thng tin ngi s dng v bo hiuIWF: InterWorking Function - Khi tng tc mng EC: Echo Canceler - Khi trit ting vng
8/8/2019 Slide GSM.03std
6/52
1. Trm di ng MS - Mobile Station
Trm di ng MS = ME + SIM
ME : Mobile Equipment - thit b di ng
SIM: Subscriber Indentity Module
Module nhn dng thu bao.
ME = hardware + software
ME EMEI = Assigned at the factory
Serial NumberFinal Assembly
Code
Type Approval
Code
6 digits 2 digits
IMEI
6 digits
Sp
1 digit
8/8/2019 Slide GSM.03std
7/52
1. Trm di ng MS - Mobile Station
SIM: lu gi cc thng tin nhn thc thu baov mt m ha/gii mt m ha.
Cc thng tin lu gi trong SIM:
Cc s nhn dng IMSI, TMSI
Kha nhn thc Ki
Kha mt m K
c S hiu nhn dng vng nh v LAI
( LAI: Location Area ID)
Danh sch cc tn s ln cn
8/8/2019 Slide GSM.03std
8/52
SIM - Subscriber Indentity Module
8/8/2019 Slide GSM.03std
9/52
S nhn dng IMSI v MSISDN
Mobile subscriber
Identification code (MSIC)
Mobile
Network Code
(MNC)
Mobile country
Code (MCC)
3 digits 2 digits Up to 10 digits
S IMSI: International Mobile SubscriberIdentity => S nhn
dng MS bi h thng, phc v bo hiu v iu khin.
Subscriber number(SN)
National
Destination code
(NDC)
Country code(CC)
S MSISDN: Mobile Station ISDN number => S danh b ,
c nhn dng bi thu bao, phc v qu trnh thit lp cuc gi.
8/8/2019 Slide GSM.03std
10/52
IMSI and MSISDN
xxxxxxx01
Mobiphone
452
Vit nam
MCC MNC MSIC
xxxxxxx90Mobiphone
84Vit nam
xxxxxxx02
Vinaphone452
Vit nam
CC NDC SN
xxxxxxx91
Vinaphone
84
Vit nam
8/8/2019 Slide GSM.03std
11/52
S nhn dng thu bao tm thi TMSI
TMSI c b ghi nh v tm trc VLR cp pht cho MS. TMSI nhn dng duy nht mt MS trong vng iu khin ca 1 VLR.
TMSI c cu trc ti a 32 bits.
BTS
Ex
ng dy thu bao tng t
Giao din v tuyn s
IMSI TMSI
8/8/2019 Slide GSM.03std
12/52
Bng phn loi MS - GSM900
Loiclass
nhySentivity
Pmax Pmin P
1 -104 dBm 20 w Khng dng
2 -104 dBm 8w 39 dBm 3,2 mw 18
3 -104 dBm 5w 37 dBm 3,2 mw 17
4 -102 dBm 2,5w 34 dBm 3,2 mw 15
5 -102dBm 0,8w 29 dBm 3,2 mw 13
5 dBm
8/8/2019 Slide GSM.03std
13/52
Bng phn loi MS DCS1800
Loiclass
nhySentivity
Pmax Pmin P
1 -100 dBm 1 w 30 dBm 1 mw 16
2 -100 dBm 0,25 w24 dBm 1 mw 13
3 -102 dBm 4 w 36 dBm 1 mw 19
0 dBm
8/8/2019 Slide GSM.03std
14/52
S bc iu khin cng sut
Cng sut pht ca MS:P = Pmin Pmax Pmin = 3,2 W 5 dBm
Loi MS => Pmax = 0,8 8 w
Gi tr bc iu khin cng sut:P = 2 dBm
Ti bc iu khin cng sut i, ta c:
Pt MS = Pmin + P*i = 5 dBm + 2*itrong : i = 0 n-1
n = tng s mc iu khin cng sut
v d: MS loi 2: Pmax = 39 dBm => n = 18? ?
8/8/2019 Slide GSM.03std
15/52
2. Cc phn h ca mng GSM/DCS
8/8/2019 Slide GSM.03std
16/52
2.1 Phn h trm gc BSS
BSS: Base Station Subsystem
BSS = TRAU + BSC + BTS
TRAU ( XCDR ): B chuyn i m v phi hptc .
BSC: B iu khin trm gc.
BTS: trm thu pht gc.
BSS kt ni vi NSS qua lung PCM c s
2 Mbps.
8/8/2019 Slide GSM.03std
17/52
8/8/2019 Slide GSM.03std
18/52
BSSs components
8/8/2019 Slide GSM.03std
19/52
Trm thu pht gc BTS
BTS: Base Tranceiver Station
Trm thu pht gc BTS thc hin cc chc
nng sau:
Thu pht v tuyn (Radio Carrier Tx and Rx)
nh x knh logic vo knh vt l
( Logical to physical Ch Mapping )
M ha/gii m ha (Coding/Decoding) Mt m ha/gii mt m ha(Ciphering/Deciphering)
iu ch / gii iu ch (Modulating/ Demodulating)
8/8/2019 Slide GSM.03std
20/52
Bng phn loi BTS - GSM900
Loi - class Pmax (w) Pmax (dBm)
1 320 55
2 160 52
3 80 49
4 40 46
5 20 43
6 10 40
7 5 37
8 2,5 34
8/8/2019 Slide GSM.03std
21/52
Bng phn loi BTS - DCS1800
Loi - class Pmax (w) Pmax (dBm)
1 20 43
2 10 40
3 5 37
4 2,5 34
8/8/2019 Slide GSM.03std
22/52
B iu khin trm gc BSC
BSC: Base Station Controller
B iu khin trm gc BSC thc hn cc chc
nng sau: iu khin mt s trm BTS: x l cc bn tin bo
hiu, iu khin,vn hnh & bo dng i/n BTS.
Khi to kt ni.
iu khin chuyn giao:Intra & Inter BTS HO
Kt ni n MSC, BTS v OMC.
8/8/2019 Slide GSM.03std
23/52
Cu hnh BSS
BTSBTS
BSC
BTS
BTS
BTS
BTS
1
2
3
4
6
7
BTS
5
BTS t gn: co-located BTS:
BTS xa: remote BTS:
* V tr ca BTS so vi BSC:
* Cu hnh kt ni cc BTS:
Hnh sao: star - ,,
Hnh chui: chain - ,,,
Mch vng: loop - ,, ,, ,,
8/8/2019 Slide GSM.03std
24/52
B chuyn i m v phi hp tc TRAU
TRAU: Transcoding and Rate Adaption Unithoc XCDR: TransCoDeR
chuyn
i
m
MSC
PCM: 64 Kpbs
LPC: 13 Kpbs
BSCMUX
+ header: 3 Kpbs
Ghp knh:4*(3+13) = 64 Kpbs
Tc 1 knhthoi: 16 Kpbs
1
2
3
4
1 TS 1 knhthoi: 64 kbps
1 TS (64kpbs) 4 knh (16kpbs)
8/8/2019 Slide GSM.03std
25/52
V tr ca TRAU (XCDR)
TRAU
BSC
MSCBTS
N x 2Mbps
Mi lung E1 =
2Mbps
30 knhthoi (64kpbs)
TRAU t ti BSC:
TRAU t ti MSC:
TRAUBTS
N x 2Mbps
1 lung E1 = 2Mbps 120 knh thoi
(16kpbs)
MSCBSC
8/8/2019 Slide GSM.03std
26/52
Cc thnh phn ca mng GSM
8/8/2019 Slide GSM.03std
27/52
8/8/2019 Slide GSM.03std
28/52
V d 1.
1 BTS loi 5 ph sng ti vng ngoi ca mng
GSM900, 1 trm di ng loi 2 c cp pht knh
tn s ARFCN = 15.
( ARFCN: Absolute Radio Frequency Channel Number )
Hy cho bit:
a. S dng m hnh Hata, hy cho bit suy hao ng
truyn khi MS cch BTS 2 km.
b. Khi MS loi 3 c thu c tn hiu t BTS hay
khng ?
8/8/2019 Slide GSM.03std
29/52
Cc phn h ca mng GSM/DCS
8/8/2019 Slide GSM.03std
30/52
2.2 Phn h chuyn mch NSS (SSS)
NSS: Network Switching Subsystem
8/8/2019 Slide GSM.03std
31/52
Tng i di ng MSC
Chc nng: X l cuc gi (call procesing). iu khin chuyn giao (Handover control). Qun l di ng (mobility management). X l tnh cc (billing).
Tng tc mng (interworking function):GatewayMSC
GMSC
8/8/2019 Slide GSM.03std
32/52
B nh v thng tr HLR
HLR l c s d liu tham chiu lu gi lu di cc thng tin v thubao.
Cc s nhn dng: IMSI, MSISDN. Cc thng tin v thu bao Danh sch dch v MS c/hn ch s dng.
S hiu VLR ang phc v MS
HLR: Home Location Register
8/8/2019 Slide GSM.03std
33/52
B nh v tm tr VLR
VLR l c s d liu trung gian lu gi tm thithng tin v thu bao trong vng phc v MSC/VLRc tham chiu t c s d liu HLR. Cc s nhn dng: IMSI, MSISDN,TMSI.
S hiu nhn dng vng nh v ang phc v MS. Danh sch dch v MS c/hn ch s dng Trng thi ca MS (bn: busy; ri : idle)
VLR: Visitor Location Register
8/8/2019 Slide GSM.03std
34/52
Trung tm nhn thc AuC
AuC (AC) l c s d liu lu gi m kha c nhnKi ca cc thu bao v to ra b ba tham s nhnthc triple: RAND, Kc,SRES khi HLR yu cu tin hnh qu trnh nhn thc thu bao.
AuC: Aunthentication Center
8/8/2019 Slide GSM.03std
35/52
B ba thng s nhn thc triple
8/8/2019 Slide GSM.03std
36/52
Khi nhn dng thit b EIR
EIR: Equipment
Identity Register
EIR l c s d liu thng tin v tnh hp l cathit b ME qua s IMEI.
Mt thit b s c s IMEI thuc 1 trong 3 danhsch:
+ Danh sch trng (white list) -> valid ME+ Danh sch en (black list) -> stolen ME+ Danh sch xm (gray list) -> ME is fauly or do not
meet curent GSM specifications
8/8/2019 Slide GSM.03std
37/52
Nu s khc bit gia nhn dngthu bao so vi nhn dng thit b
1.1.Cho php GSM nh tuyn cuc gi, tnh ccCho php GSM nh tuyn cuc gi, tnh cc
thu bao di ng.thu bao di ng.
2.2. Nhn dng thit b b nh cp.Nhn dng thit b b nh cp.
3.3.Khng nh thit b c cung cp bi mt nhKhng nh thit b c cung cp bi mt nh
cung cp dch v GSM.cung cp dch v GSM.
8/8/2019 Slide GSM.03std
38/52
Phn h vn hnh v bo dng OMS
OMS: Operation and Maintenance Subsystem
Cc thnh phn ca phn h NSS v BSS (BSC,BTS,TRAU) c iu hnh, theo di v bo dngtp trung thng qua phn h OMS.
OMS c th bao gm 1 hoc nhiu trung tm vnhnh bo dng OMC ( Operation & MaintenanceCenter)
8/8/2019 Slide GSM.03std
39/52
Trung tm vn hnh v bo dng OMC
OMC:Operation and
Maintenance
Center
8/8/2019 Slide GSM.03std
40/52
Trung tm vn hnh v bo dng OMC
8/8/2019 Slide GSM.03std
41/52
Trung tm vn hnh v bo dng OMC
Phn loi OMC:
+ OMC-S (switching): qun l phn h NSS
+ OMC-R (Radio): qun l phn h BSS
OMC thc hin cc chc nng:
+ Qun l cnh bo - Event/alarm manegament.
+ Qun l li - Fault manegament
+ Qun l cht lng performance manegament.
+ Qun l cu hnh configuration manegament.
+ Qun l bo mt sercurity manegament.
8/8/2019 Slide GSM.03std
42/52
GSM networks functions
A GSM network performs 5 main functions:
Transmission (data & signalling; MS, BTS, BSC)
Communication/Connection Management (CM)
Radio Resources Management (RRM)
Mobility Management (MM)
Operation, Administration & Maintenance (OAM)
8/8/2019 Slide GSM.03std
43/52
Cc thnh phn ca mng GSM
8/8/2019 Slide GSM.03std
44/52
8/8/2019 Slide GSM.03std
45/52
GSM networks structure
8/8/2019 Slide GSM.03std
46/52
GSM networks structure
8/8/2019 Slide GSM.03std
47/52
8/8/2019 Slide GSM.03std
48/52
Vng ph sng - Mobiphone VMS
8/8/2019 Slide GSM.03std
49/52
Vng ph sng - Vinaphone
Min Bc
KV1: H Ni v
cc tnh pha Bc
n Qung Bnh
Vng 1
8/8/2019 Slide GSM.03std
50/52
KV1: Cc tnh min Trung
t Qung tr n Khnh
ha v tnh Ty nguyn
Vng 3
Vng ph sng -Vinaphone
8/8/2019 Slide GSM.03std
51/52
Vng ph sng - Vinaphone
KV2: TP. H Ch Minh
v cc tnh pha Nam t
Ninh thun n C mau
Vng 2
8/8/2019 Slide GSM.03std
52/52
Ch tiu k thut h thng GSM