L1_intro - EEC173B/ECS152C, Spring 2010 Computers for the...

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Page 1 EEC173B/ECS152C, Spring 2010 Introduction to Wireless/Mobile Networking Motivation Design Constraints & Challenges Taxonomy & Class Roadmap History & Evolution Areas of Research Acknowledgment: Selected slides from Prof. Schiller & Prof. Goldsmith 2 Computers for the next decades? Computers are integrated Small, cheap, portable, replaceable no more separate devices 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 3 Wireless vs. Mobile Communication Two aspects of mobility: User mobility : users communicate “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 (Ethernet) wireless LANs in historic buildings  Personal Digital Assistant (PDA) 4 Mobile Communication 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 5 Principles of Mobile Computing Accessibility Interface should be simple and intuitive to allow for quick, on the spot information access. Location Awareness Information should always be relevant to the user ʹ s current location. Computer are aware of their environment and adapt Context Awareness Computer recognize the location of the user and react appropriately (e.g., call forwarding, fax forwarding) Mobility Device should be efficient in both space and weight freeing the users from physical burdens. Security Device should be secure enough for users to store personal data and respect user ʹ s privacy. 6 Applications (1) 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, . ..
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Page 2 7 Example Application: Road Traffic a d h o c UMTS, WLAN, DAB, GSM, cdma2000, TETRA, . ..
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L1_intro - EEC173B/ECS152C, Spring 2010 Computers for the...

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