Wireless and Mobile Technology-Introduction

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Mobile Communications
Summer Term 2005 FU Berlin Computer Science Computer Systems & Telematics Prof. Dr.-Ing. Jochen Schiller http://www.jochenschiller.de/ schiller@computer.org Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 1.1

Overview of the lecture
Introduction
Use-cases, applications Definition of terms Challenges, history

Broadcast Systems
DAB, DVB

Wireless LANs
Basic Technology IEEE 802.11a/b/g, .15, Bluetooth

Wireless Transmission
frequencies & regulations signals, antennas, signal propagation multiplexing, modulation, spread spectrum, cellular system

Network Protocols
Mobile IP Ad-hoc networking Routing

Media Access
motivation, SDMA, FDMA, TDMA (fixed, Aloha, CSMA, DAMA, PRMA, MACA, collision avoidance, polling), CDMA

Transport Protocols
Reliable transmission Flow control Quality of Service

Wireless Telecommunication Systems
GSM, HSCSD, GPRS, DECT, TETRA, UMTS, IMT-2000

Support for Mobility
File systems, WWW, WAP, i-mode, J2ME, ...

Satellite Systems
GEO, LEO, MEO, routing, handover

Outlook

Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/

MC SS05

1.2

Chapter 1:

Introduction

A case for mobility – many aspects History of mobile communication Market Areas of research

Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/

MC SS05

1.3

Computers for the next decades?
Computers are integrated
small, cheap, portable, replaceable - no more separate devices

Technology is in the background
computer are aware of their environment and adapt (“location awareness”) computer recognize the location of the user and react appropriately (e.g., call forwarding, fax forwarding, “context awareness”))

Advances in technology
more computing power in smaller devices flat, lightweight displays with low power consumption new user interfaces due to small dimensions more bandwidth per cubic meter multiple wireless interfaces: wireless LANs, wireless WANs, regional wireless telecommunication networks etc. („overlay networks“) Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 1.4

Mobile communication
Two aspects of mobility:
user mobility: users communicate (wireless) “anytime, anywhere, with anyone” device portability: devices can be connected anytime, anywhere to the network

Wireless vs. mobile

Examples
stationary computer notebook in a hotel wireless LANs in historic buildings Personal Digital Assistant (PDA)

The demand for mobile communication creates the need for integration of wireless networks into existing fixed networks: local area networks: standardization of IEEE 802.11, ETSI (HIPERLAN) Internet: Mobile IP extension of the internet protocol IP wide area networks: e.g., internetworking of GSM and ISDN Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 1.5

Applications I
Vehicles
transmission of news, road condition, weather, music via DAB personal communication using GSM position via GPS local ad-hoc network with vehicles close-by to prevent accidents, guidance system, redundancy vehicle data (e.g., from busses, high-speed trains) can be transmitted in advance for maintenance

Emergencies
early transmission of patient data to the hospital, current status, first diagnosis replacement of a fixed infrastructure in case of earthquakes, hurricanes, fire etc. crisis, war, ...

Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/

MC SS05

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Typical application: road traffic

UMTS, WLAN, DAB, DVB, GSM, cdma2000, TETRA, ...

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Personal Travel Assistant, PDA, Laptop, GSM, UMTS, WLAN, Bluetooth, ... Prof. Dr.-Ing. Jochen Schiller, http://www.jochenschiller.de/ MC SS05 1.7

Mobile and wireless services – Always Best Connected
GSM/GPRS 53 kbit/s Bluetooth 500 kbit/s UMTS, GSM 115 kbit/s LAN 100 Mbit/s, WLAN 54 Mbit/s

DSL/ WLAN 3 Mbit/s

UMTS 2 Mbit/s

GSM/EDGE 384 kbit/s, DSL/WLAN 3 Mbit/s GSM 115 kbit/s,...
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