Chp 01 Oma000001 Gsm Nss Issue3.2

Wireless Curriculum Development SectionWireless Curriculum Development SectionWireless Curriculum Development SectionWireless Curriculum Development Section

ISSUEISSUE 3.23.2

OMA000001OMA000001GSM FundamentalsGSM Fundamentals

OMA000001OMA000001GSM FundamentalsGSM Fundamentals

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Security Level: InternalConfidential Information of Huawei. No Spreading without Permission.

Contents Contents

GSM Network ComponentsGSM Network Components

Terrestrial Interface

Service Area and Number Planning

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On completion of this section you will be able to:

Draw the structure of GSM

Identify the functions of each component

ObjectivesObjectives

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AUCAUC

MEME SIMSIM

OMCOMC

HLRHLR

MSC/VLRMSC/VLR

BTSBTS BSCBSC

PSTN

OSS

MS

NSS

BSS

EIREIR

GSM Network ComponentsGSM Network Components

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Mobile Station—MSMobile Station—MS

International Mobile Equipment Identity (IMEI)

– Mobile Equipment

MS=ME+SIMMS=ME+SIM

International Mobile Subscriber Identity (IMSI)

– Subscriber Identity Module

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Subscriber Identity Module – SIMSubscriber Identity Module – SIM


Temporary Mobile Subscriber Identity (TMSI)

Location Area Identity (LAI) Subscriber Authentication Key

(Ki) Mobile Station International

Standard Data Network (MSISDN),

it is optional.


Temporary Mobile Subscriber Identity (TMSI)

Location Area Identity (LAI) Subscriber Authentication Key

(Ki) Mobile Station International

Standard Data Network (MSISDN),

it is optional.

GS

M

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Mobile Switching Center – MSC Home Location Register – HLR Visitor Location Register – VLR Equipment Identity Register – EIR Authentication Center – AUC Inter-Working Function – IWFEcho Cancellor – EC

Mobile Switching Center – MSC Home Location Register – HLR Visitor Location Register – VLR Equipment Identity Register – EIR Authentication Center – AUC Inter-Working Function – IWFEcho Cancellor – EC

AUCAUCHLRHLR

MSC/VLRMSC/VLR

PSTN

NSS

EIREIROMC

BSS

ECEC

IWFIWF

The Network Switching SystemThe Network Switching System

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Mobile Service Switching Center – MSC Mobile Service Switching Center – MSC

Call Processing

Operations and Maintenance

Support

Inter-network & Inter-working

Billing

Call Processing

Operations and Maintenance

Support

Inter-network & Inter-working

Billing

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Home Location Register – HLR Home Location Register – HLR

Subscriber ID (IMSI and MSISDN)

Current subscriber VLR (current location)

Supplementary service information

Subscriber status (registered/deregistered)

Authentication key and AuC functionality

Subscriber ID (IMSI and MSISDN)

Current subscriber VLR (current location)

Supplementary service information

Subscriber status (registered/deregistered)

Authentication key and AuC functionality

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Visitor Location Register – VLR Visitor Location Register – VLR

Mobile Status(IMSI detached/ attached)

Location Area Identity(LAI)

Temporary Mobile Subscriber Identity(TMSI)

Mobile Station Roaming Number(MSRN)

Mobile Status(IMSI detached/ attached)

Location Area Identity(LAI)

Temporary Mobile Subscriber Identity(TMSI)

Mobile Station Roaming Number(MSRN)

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IMEIIs Checked against White List

IMEIIs Checked against Black/Grey List

If NOT found, checked against Grey/Black List

If NOT found, checked against White List indications

If found, returns a Black or Grey List indicator

•White List•Black List•Grey List

Equipment Identity Register – EIR Equipment Identity Register – EIR

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• Rate Conversion• Protocol Adaptation

PSTN

MSCMSC

ECEC IWF

Inter-Working Function – IWFInter-Working Function – IWF

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Echo takes place by GSM system delay caused by call processing,speech encoding and decoding etc.An Echo Canceller is used on the PSTN side of the MSC for all voice circuits

2-wire4-wire

2- wire

Hybrid Hybrid

Generation of Echo at 2-wire to 4-wire Interface

Echo Canceller － ECEcho Canceller － EC

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OSS(NMC)

OMCOMC

OMC

Region2

Region 1

Region 3

Operation and Maintenance Sub SystemOperation and Maintenance Sub System

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Operation and Maintenance Center – OMC Operation and Maintenance Center – OMC

OMC – R: OMC assigned specifically to the Base Station Subsystem

OMC – S: OMC assigned specifically to the Network Switching Subsystem

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OMC Functional ArchitectureOMC Functional Architecture

OS

MMI

DB

Event/AlarmManagement

SecurityManagement

ConfigurationManagement

Performance Management

Fault Management

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Contents Contents

GSM Network Components

Terrestrial InterfaceTerrestrial Interface


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Identify the protocols used on the terrestrial interfaces between the GSM system entities


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HLR

VLR

MSC

EIR

AUC

EC IWF

TC

VLR

MSC

IWF EC

BTS BSCMS

B

H

F

G

A

E

C

D

Um Abis

GSM InterfaceGSM Interface

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CM

MM

RR

LAPDm

SigL1

L3

L2

L1

MS

RR BTSM

LAPDm

SigL1

LAPD

SigL1

LAPD

SigL1

BTSM

RR

SCCP

MTP

BSSMAP

CM

MM

BSSMAP

SCCP

MTP

MSCBSCBTS

Um½Ó¿Ú A½Ó¿ÚAbis½Ó¿Ú

GSM ProtocolGSM Protocol

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HLR

MSC/VLR

EIRAUC

EC

OMC

MSC/VLR

TC

IWF

EC

BSC PSTN

BTSBTS BTS

SigL1: 2MBps TrunksSigL1: 2MBps Trunks

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Typical Configuration

TS 0 TS 1-15 TS16 TS 17-31

TS = Time slot

TS# Used for

0

1-15

16

17-31

Frame Alignment /Error Checking /Signaling

Traffic

CCS7 Signaling (Other TS may also the used)

Traffic

2MBps Trunks2MBps Trunks

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OSI Layers

7. Application

6. Presentation

5. Session

4. Transport

3. Network

2. Link

1 Physical

CCS7 Levels

MTP Level 1 2 Mb/s Trunk

MTP Level 3

TUP

SCCP

BSSAP(DTAP+BSSMAP)ISUP

MAP

TCAP

MTP Level 2

ITU Signaling System CCS7 ITU Signaling System CCS7

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Abbreviation of CCS7Abbreviation of CCS7

MTP Message Transfer Part TCAP Transaction Capabilities Application SCCP

Signaling Connection Control Part TUP Telephone User Part ISUP ISDN User Part MAP Mobile Application Part BSSAP Base Station System Application Part BSSMAP BSS Management Application Part DTAP Direct Transfer Application Part

MTP Message Transfer Part TCAP Transaction Capabilities Application SCCP

Signaling Connection Control Part TUP Telephone User Part ISUP ISDN User Part MAP Mobile Application Part BSSAP Base Station System Application Part BSSMAP BSS Management Application Part DTAP Direct Transfer Application Part

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Contents Contents



Service Area and Number PlanningService Area and Number Planning

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Identify the system identification number

Identify the of mobile identification number

Identify the cell identification number


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Service AreaService Area

PLMN service area

......

System area PLMN service area

MSC service area...

Location area...

Base station area...

Radio cell

...... ......

MSC service area...

Location area...

Base station area...

Radio cell

PLMN service area

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MSC/VLR NumberMSC/VLR Number

The format is CC+NDC+LSPCC ： Country Code. For example: The CC of Bangladesh is “88”

NDC ： National Destination Code. For example: The NDC of AKTEL is “018”.

LSP(locally significant part): is defined by Telecom operator.For example: 88-018-0159951

CC NDC LSP

MSC/VLR number

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HLR NumberHLR Number

The format is ： CC+NDC+H0 H1 H2 H3 0000.CC ： Country Code. For example: The CC of Bangladesh is “88".

NDC ： National Destination Code. For example: The NDC of Aktel is 018H0H1H2H3 is defined by Telecom operator.For example: 88-018-099501

The format is ： CC+NDC+H0 H1 H2 H3 0000.CC ： Country Code. For example: The CC of Bangladesh is “88".

NDC ： National Destination Code. For example: The NDC of Aktel is 018H0H1H2H3 is defined by Telecom operator.For example: 88-018-099501

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LAILAI

Location Area Identification

The LAI is the international code for a location area.

MCC ： Mobile Country Code ， It consists of 3 digits . For example: The MCC of Bangladesh is "470"MNC ： Mobile Network Code ， It consists of 2 digits . For example: The MNC of Aktel is "02"LAC ： Location Area Code ， It is a two bytes BCD code(he

x). The value 0000 and FFFF is invalid.For example: 470-02-0011

MCC ： Mobile Country Code ， It consists of 3 digits . For example: The MCC of Bangladesh is "470"MNC ： Mobile Network Code ， It consists of 2 digits . For example: The MNC of Aktel is "02"LAC ： Location Area Code ， It is a two bytes BCD code(he

x). The value 0000 and FFFF is invalid.For example: 470-02-0011

MCC MNC LAC

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CGICGI

The CGI is a unique international identification for a

cell

The format is LAI+CI

LAI: Location Area Identification

CI ： Cell Identity. This code uses two bytes BCD

code(hex) to identify the radio cells within an LAI.

For example : 470-02-0011-0001

The CGI is a unique international identification for a

cell

The format is LAI+CI

LAI: Location Area Identification

CI ： Cell Identity. This code uses two bytes BCD

code(hex) to identify the radio cells within an LAI.

For example : 470-02-0011-0001

CGI: Cell Global Identification

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CC ： Country Code. For example: The CC of Bangladesh is "88".

NDC ： National Destination Code. For example: The NDC of Aktel is 18

SN ： Subscriber Number. Format:H0 H1 H2 H3 ABCDExample: 88-018-705-1911

CC ： Country Code. For example: The CC of Bangladesh is "88".

NDC ： National Destination Code. For example: The NDC of Aktel is 18

SN ： Subscriber Number. Format:H0 H1 H2 H3 ABCDExample: 88-018-705-1911

MSISDNMSISDN

CC NDC SN

National (significant)Mobile number

Mobile station internationalISDN number

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MCC ： Mobile Country Code ， It consists of 3 digits . For example: The MCC of Bangladesh is "470" 。MNC ： Mobile Network Code ， It consists of 2 digits . For example: The MNC of Aktel is "02" 。MSIN ： Mobile Subscriber Identification Number. H1H2H3 S ABCDE

F For example: 666-9777001NMSI ： National Mobile Subscriber Identification ， MNC and MSIN

form it together. For Example of IMSI : 470-02-666-9777001

MCC ： Mobile Country Code ， It consists of 3 digits . For example: The MCC of Bangladesh is "470" 。MNC ： Mobile Network Code ， It consists of 2 digits . For example: The MNC of Aktel is "02" 。MSIN ： Mobile Subscriber Identification Number. H1H2H3 S ABCDE

F For example: 666-9777001NMSI ： National Mobile Subscriber Identification ， MNC and MSIN

form it together. For Example of IMSI : 470-02-666-9777001

Not more than 15 digits

3 digits 2 digits

IMSI

MCC MNC MSIN

NMSI

IMSI IMSI

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The TMSI is assigned only after successful subscriber authentication.

The VLR controls the allocation of new TMSI numbers and notifies them to the HLR.

TMSI is used to ensure that the identity of the mobile subscriber on the air interface is kept secret.

The TMSI consists of 4 bytes (8 HEX numbers) and determined by the telecom operator.

The TMSI is assigned only after successful subscriber authentication.

The VLR controls the allocation of new TMSI numbers and notifies them to the HLR.

TMSI is used to ensure that the identity of the mobile subscriber on the air interface is kept secret.

The TMSI consists of 4 bytes (8 HEX numbers) and determined by the telecom operator.

TMSITMSI

TMSI: Temporary Mobile Subscriber Identification)

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IMEIIMEI

TAC FAC SNR SP

IMEI

TAC ： Type approval code. It is administered by the type approval center.

FAC ： Final assembly code.It is administered by the manufacturer.

SNR ： Serial number.It is issued by the manufacturer of the MS.

SP ： Not used.

TAC ： Type approval code. It is administered by the type approval center.

FAC ： Final assembly code.It is administered by the manufacturer.

SNR ： Serial number.It is issued by the manufacturer of the MS.

SP ： Not used.

IMEI: International Mobile Station Equipment Identification

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MSRN/HONMSRN/HON

The MSRN is used to route the call to the MSC which MS is currently located.

The HON is used by the MSC-A to set up a connection to the MSC-B during handover process

Usually, MSRN and HON share the same numbering plan. The format is CC+NDC+individual number. CC and NDC

is the same as that of MSISDN. The individual number is taken from a pool of numbers specially reserved for MSRN.

The MSRN is used to route the call to the MSC which MS is currently located.

The HON is used by the MSC-A to set up a connection to the MSC-B during handover process

Usually, MSRN and HON share the same numbering plan. The format is CC+NDC+individual number. CC and NDC

is the same as that of MSISDN. The individual number is taken from a pool of numbers specially reserved for MSRN.

MSRN: Mobile Subscriber Roaming Number

HON: Hand-over Number

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SummarySummary

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Chp 01 Oma000001 Gsm Nss Issue3.2

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