UCD ECS 257 - ECS 257 Introduction (21 pages)

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ECS 257 Introduction



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ECS 257 Introduction

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Pages:
21
School:
University of California, Davis
Course:
Ecs 257 - Mobile and Wireless Networks
Mobile and Wireless Networks Documents

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Introduction A Brief History Wireless communications originated with the demonstration by Tesla in 1893 followed by the invention of wireless telegraph by Marconi in 1896 Advances in wireless communications have led to radio television mobile telephones and communication satellites Development of wireless networks LAN MAN and WAN Trend continues Voice Data Broadband Need to support mobility Trends Revenue for wireless communication industry has surpassed that of wired telephony industry Wireless applications span both local area and wide area for voice oriented services and data oriented services Global cellular networks are providing very convenient communication infrastructure Broadband wireless networks are evolving Wireless LANs are very popular Evolution of Personal Communication Systems Integrating the network intelligence of today s PSTN public switched telephone network with modern digital signal processing and RF technology Standards for facilitating ubiquitous communication support are on the way Personal communication system using wireless components are more cost effective than their wired counterpart Advances in communication technology and networking protocols are necessary to facilitate the realization of the anytime anywhere systems Applications of Mobile and Wireless Networks Low cost LAN or MAN infrastructure Replacement of wired networks Anytime anywhere access to data information in wireless mode Commercial and business applications Sensors RFID Short range communications Location dependent services Emergency and disaster recovery services Vehicular communications Mobile and Wireless Devices Notebook Laptop computers PDAs Mobile phones and pagers Sensors Embedded controllers in appliances Switching infrastructure APs Wireless Communication Fundamentals Characteristics of Wireless Medium Comparison to wired media Unguided link Unreliable Low bandwidth Untethered supports mobility Broadcast nature Shared medium Capacity limitation Frequency of



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