02 Arhitectura GSM

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Arhitectura functionala GSM

BSS ± Base Station System

PSTN/

ISDN

TC

NNS

BSS



In cazul unei configuratii multibanda putem avea:

3x2 TRX 900Mhz + 3x2 TRX 1800Mhz in acelasi cabinet

tip

cabinetconfiguratie

TRX max

/sector

IND mini

Omni

2 sectoare

4

2

IND medi

Omni

2 sectoare

3 sectoare

12

6

4

OUT mini

Omni

2 sectoare

3 sectoare

4

2

2

OUT medi

Omni

2 sectoare

3 sectoare

12

6

4

Echipamente BSSBTS ± Evolium Base Tranceiver Station:

Alcatel 9100



Echipamente BSS

BTS ± Evolium Base Tranceiver Station: Alcatel 9100

12 TRX BTS with dualband, EFR and GPRS inside

Continuous improvement in design with backward compatibility:

Standard version (1998)

EFR, dualband, 12 TRX E volution Step 1 (2000)

AC power supply, integrated Microwave,

3x2 indoor MINI cabinet

E volution Step 2 (2000)

EDGE/GPRS/GSM new standard TRX Stand-alone UMTS Node B: (2001)

Multistandard BTS (2002)

UMTS TRX plug-in



HLR GCR

Arhitectura functionala GSM

interfete si protocoale

AuC

E

B C

D

F

GH

I

Abis

BCD

EFGH

I

PSTN

ISDN

BTS - BSC

MSC-VLR(SM-G)MSC-HLR

HLR-VLR

(SM-G)MSC-MSC (SS7 basic) + MAPMSC-EIRVLR-VLRHLR-AuC

MSC-GCR

MSC-PSTN(SS7 basic) + TUP or ISUP

MSC-ISDN

LAPD(ISDN type)

GSM Circuit-switching:

(BSS AP = BSSM AP + DT AP)

A BSC - MSC (SS7 basic) + BSSAP

LAPDm(GSM specific)

Um (Radio) MS - BTS

MSCMSC

PSTN /

ISDN

MS

VLR VL

R

EI

R



Schimburi in retea: secventa tipica de apel

MOBILE

CHANNEL REQUEST

IMMEDIATE ASSIGNMENT

CM SERVI

CE REQUEST

AUTHENTICATION REQUEST

AUTHENTICATION RESPONSE

CIPHERING MODE CMDCIPHERING MODE COMPLETE

SET UP

CALL

P

ROCEEDING

ASSIGNMENT CMD

ASSIGNMENT COM

ALERTING

CONNECT

CONNECT ACK

SET-UP of anRR CONNECTION (MO)

SERVICE INDICATION

AUTHENTICATION

TRANSITION to CIPHERING MODE

START of CALL

TRAFFIC CHANNEL

CALL CONFIRMATION

CALLACCEPTED

ASSIGNMENT

...

«

«

...

GSM

NetworkPSTN or ISDN



SDCCH N°

MM CM_SERVICE REQUEST

SDCCH N°

RACH

Schimburi in retea: stabilirea unei conexiuni radio

MSCHANNEL REQUEST

IMMEDIATE ASSIGN.

BTS BSC MSC

Um A bis A

CHANNEL REQUIRED

ASSIGNM E NT of an

SDCCH Channel CHANNELACTIV.

ACTIVATION of Channel indicated

CHANNELACTIV. ACK

AGCH

CONN E CTION to theSDCCH Channel

SDCCH SABM ESTABLISH INDIC.

SCCPCONNECT REQUEST

SCCPCONNECT CONFIRM

T3101

T9105

IMM. ASSIGN. CMD

RR

RR


RR

BTSM

BTSM

BTSM

SDCCH UA



...

«

«

...



RACH

AGCH

SDCCH

Schimburi in retea: actualizarea locatiei

CHANNEL REQUEST

IMMEDIATE ASSIGN.

CHANNEL REQUIRED

CHANNEL ACTIV.

CHANNEL ACTIV. ACK

SABM

UA

ESTABLISH INDIC.SCCPCONNECT REQUEST

SCCPCONNECT CONFIRM

IMM. ASSIGN. CMD

MS BTS BSC MSC

Um A bis A

VLR

SCCPDATADATA REQUESTLOCATION UPDATING

ACCEPT

TMSI

TMSIREALLOC COMPLETEDATA INDICATION SCCPDATA

HLR

UPDATE LOCATIONAREA UPDATE LOCATION

UPDATE LOCATION ACC

INSERT SUBSCR. DATA

LOC. AREA UPD. ACC.INSERT SUB. DATA ACK

TMSI Alloc .

RR

RR

MM

Loc . Upd . Req .MM

RR

BTSM

BTSM

BTSM

MAP MAP

MAP

MAP

MAP MAP

MM

TMSI Realloc . compl .MM TMSI Realloc . compl .MM

Loc . Upd . Req .MM Loc . Upd . Req .MM Loc . Upd . Req .MM

Loc . Upd . Acc .MM Loc . Upd . Acc .MM

...

«

«

...



PSTN or ISDN

F ACCH

Release of old channel

Changeover to new channel

Internal Handover decision

Schimburi in retea: handover intra BSC

MEASUREMENT REPORT

HANDOVER COMMAND

CHANNEL ACTIV.

CHANNEL ACTIV. ACK

SABM

UAESTABLISH INDIC.

MS BTS 1 BSC MSC

Um A bisA

SCCPDATA

DATA REQUEST

DATA INDICATION

Handover Cmd

H .O . Performed Handover . compl .

BTS 2

(RELEASE REQUEST)

Local E nd

HANDOVER ACCESS(access burst) HANDOVER DETECTION

PHYSICA

L INFO

HANDOVER COMPLETE

T8

RF CHANNEL RELEASE

RF CHANNEL RELEASE ACK

RR MEASUREMENT REPORT

MEASUREMENT REPORTMEASUREMENT REPORTRR

BTSM

BTSM

RR RR

RR

RR

RR

BTSM

BTSM

BSSMAP RR

F ACCH

SACCH

SACCH

F ACCH

(old)

(new)

...

«

«

...



OMC-X: Operation and Maintenance Centre

X: BSS/NSS/Transmisiuni

analizeaza alarmele din entitati

instaleaza noi elemente de software

parametrizeaza elementele

OSS: Operations Support System



OSS (Operations Support System)

Network Management Center (Operation & Maintenance)

SGSN

GGSN

OMC-G

OMC-S MSC/VLR

HLR

NMCQ3

MFS

BSS

OMC-R

02 Arhitectura GSM

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