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GSM and GPRS Overview

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What is GSM?

Global System for Mobile communications

European standard (CEPT/ETSI)

Services

Subsystem interfaces

Protocol architecture

First & most successful digital cellular system (2G)

Implemented mainly in Europe and Asia Pacific

Services:

Voice

Circuit switched data

SMS

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Components of a GSM network

Network Switching Subsystem (NSS)

Mobile Switching Centre (MSC)

Network databases

Base Station Subsystem (BSS)

Base Transceiver Station (BTS)

Base Station Controller (BSC)

Transcoder (TC) Network Management Subsystem (NMS)

Operations and Maintenance Centre (OMC)

Mobile Station (MS)

Mobile Equipment (ME)

Subscriber Identity Module (SIM)

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GSM Public Land Mobile Network

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Elements: MSC, VLR, HLR, AC, EIR

Functions:

Call Control: Identifying the subscribers, call establishment, clearing

Charging: Collecting charging information for billing

Mobility Management: Maintaining information about the subscribers

Signalling (towards BSS, other networks, between NSS elements)

Subscriber data and security handling in the HLR and VLR

Location Management: Locating a subscriber for mobile terminated calls

A i r A

O & M

V L RM S C

V L RM S C

HLR

Functions of NSS

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Elements: Base Station Controller (BSC), Base Transceiver Station (BTS), Transcoder (TC)

Functions: Radio path control, BTS and TC control, synchronisation with MSC

Air and A interface signalling, connection establishment MS - NSS Mobility management, speech transcoding

Collection of statistical data

BT

S

TC

BS

C

BS

CTC

BT

S

BT

S

Functions of BSS

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Tasks of NMS: Fault management Configuration management Performance management

BSC

HLR/AC/EIR

TCSM

MSC/VLR

App. Servers

Database andCommunications

Servers

NetAct

GSM Network

Router

DataCommunicationsNetwork (DCN)

Network Management Subsystem

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Nokia GSM network architecture

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FDD and TDD

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FDMA and TDMA

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Circuit switched

Packet switched

Circuit switched vs. Packet switched

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Circuit switched vs. Packet switched

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GSM and Packet Orientated Services

Internet service as perceived from the subscribers

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Data service offered by a PSTN-operator

Access to requested Packet Data Networks

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GPRS Enabled increased data rates

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Increased radio interface efficiency

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Mobile Access Operator

Operator acts as transparent bit-pipe

Limited differentiation possibilities:price, bit rate, availability, etc.

The ISPs control theend-customers through actual servicesand content access

Small risks for the operator:low cost, small revenue opportunity

Internet

WWW

ISP or

content

provider

Operator Type 1

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Full-Service Operator

Contentproviders

Corporations

Internet

Multimedia

Service

Center

SMS,

HSCSD,

GPRS,

3rd generation

Operator adds value by offeringservices with value to the end-user

Opportunity to differentiate:

customer loyalty

new customers andrevenue streams

brand recognition

Higher risk, new competenciesrequired

Operator Type 2