slide gsm.03std

8/8/2019 Slide GSM.03std

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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


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CHNG 2

H thng GSM

1. Cu trc mng GSM


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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.


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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


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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


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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


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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


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SIM - Subscriber Indentity Module


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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.


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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


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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


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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


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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


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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? ?


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2. Cc phn h ca mng GSM/DCS


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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.


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BSSs components


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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)


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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


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Bng phn loi BTS - DCS1800

Loi - class Pmax (w) Pmax (dBm)

1 20 43

2 10 40

3 5 37

4 2,5 34


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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.


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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 - ,, ,, ,,


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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)


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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


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Cc thnh phn ca mng GSM


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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 ?


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Cc phn h ca mng GSM/DCS


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2.2 Phn h chuyn mch NSS (SSS)

NSS: Network Switching Subsystem


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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


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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


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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


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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


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B ba thng s nhn thc triple


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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


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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.


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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)


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Trung tm vn hnh v bo dng OMC

OMC:Operation and

Maintenance

Center


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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.


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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)


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Cc thnh phn ca mng GSM


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GSM networks structure


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GSM networks structure


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Vng ph sng - Mobiphone VMS


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Vng ph sng - Vinaphone

Min Bc

KV1: H Ni v

cc tnh pha Bc

n Qung Bnh

Vng 1


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KV1: Cc tnh min Trung

t Qung tr n Khnh

ha v tnh Ty nguyn

Vng 3

Vng ph sng -Vinaphone


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Vng ph sng - Vinaphone

KV2: TP. H Ch Minh

v cc tnh pha Nam t

Ninh thun n C mau

Vng 2


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Ch tiu k thut h thng GSM

slide gsm.03std

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