f08-Ch6 - C hapte 6 r Wire ss and MobileNe le tworks All...

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6: Wireless and Mobile Networks 6-1 Chapter 6 Wireless and Mobile Networks All material copyright 1996-2007 J.F Kurose and K.W. Ross, All Rights Reserved
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6: Wireless and Mobile Networks 6-2 Chapter 6: Wireless and Mobile Networks Background: # wireless (mobile) phone subscribers now exceeds # wired phone subscribers! computer nets: laptops, palmtops, PDAs, Internet-enabled phone promise anytime untethered Internet access two important (but different) challenges wireless: communication over wireless link mobility: handling the mobile user who changes point of attachment to network
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6: Wireless and Mobile Networks 6-3 Chapter 6 outline 6.1 Introduction Wireless 6.2 Wireless links, characteristics CDMA 6.3 IEEE 802.11 wireless LANs (“wi-fi”) 6.4 Cellular Internet Access architecture standards (e.g., GSM) Mobility 6.5 Principles: addressing and routing to mobile users 6.6 Mobile IP 6.7 Handling mobility in cellular networks 6.8 Mobility and higher-layer protocols 6.9 Summary
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6: Wireless and Mobile Networks 6-4 Elements of a wireless network network infrastructure wireless hosts laptop, PDA, IP phone run applications may be stationary (non-mobile) or mobile wireless does not always mean mobility
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6: Wireless and Mobile Networks 6-5 Elements of a wireless network network infrastructure base station typically connected to wired network relay - responsible for sending packets between wired network and wireless host(s) in its “area” e.g., cell towers, 802.11 access points
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6: Wireless and Mobile Networks 6-6 Elements of a wireless network network infrastructure wireless link typically used to connect mobile(s) to base station also used as backbone link multiple access protocol coordinates link access various data rates, transmission distance
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6: Wireless and Mobile Networks 6-7 Characteristics of selected wireless link standards Indoor 10-30m Outdoor 50-200m Mid-range outdoor 200m – 4 Km Long-range outdoor 5Km – 20 Km .056 .384 1 4 5-11 54 IS-95, CDMA, GSM 2G UMTS/WCDMA, CDMA2000 3G 802.15 802.11b 802.11a,g UMTS/WCDMA-HSPDA, CDMA2000-1xEVDO 3G cellular enhanced 802.16 (WiMAX) 802.11a,g point-to-point 200 802.11n Data rate (Mbps) data
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6: Wireless and Mobile Networks 6-8 Elements of a wireless network network infrastructure infrastructure mode base station connects mobiles into wired network handoff: mobile changes base station providing connection
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6: Wireless and Mobile Networks 6-9 Elements of a wireless network ad hoc mode no base stations nodes can only transmit to other nodes within link coverage nodes organize themselves into a network: route among themselves
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6: Wireless and Mobile Networks 6-10 Wireless network taxonomy single hop multiple hops infrastructure (e.g., APs ) no host connects to base station (WiFi, WiMAX, cellular) which connects to larger Internet no base station, no connection to larger Internet (Bluetooth, ad hoc nets) host may have to relay through several wireless nodes to connect to larger Internet: mesh net Internet. May have to relay to reach other a given wireless node MANET, VANET
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This note was uploaded on 10/27/2009 for the course CSE 830 taught by Professor Ofria during the Fall '08 term at Michigan State University.

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f08-Ch6 - C hapte 6 r Wire ss and MobileNe le tworks All...

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