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Wireless networks: from cellular to ad hoc
Transcript of Wireless networks: from cellular to ad hoc
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Wireless networks: from cellular to ad hoc
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The three wireless “waves”
•Wave #1: cellular telephony – Still, biggest profit maker
•Wave #2 : wireless Internet access – Most Internet access on US campuses is wireless– Hot spots are rapidly proliferating in the US;
Europe and Asia to follow soon– 2.5 G and 3G trying to keep up; competitive edge?
•Wave #3: ad hoc wireless nets (now)– Set up in an area with NO infrastructure; to
respond to a specific, time limited need
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Wireless Internet Options - Cellular
• 2.5 G– 1xRTT: CDMA based; 144Kbps– GPRS: Time Division based (GSM); < 100Kbps– Packet oriented; “always on”; per packet (instead of per call)
charge
• 3G– UMTS: Wide Band CDMA from 384 Kbps to 2Mbps– Integrates packet service with connection oriented service
(voice, video, etc)
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Wireless Internet Option: 802.11
• Replacement for wired Ethernet• Unlicensed spectrum (ISM)• Several options and rates
– 802.11 b: 11, 5.5, 2, 1 Mbps; @ 2.4 GHz– 802.11 a up to 54 Mbps in 5.7 GHz band – 802.11 n, up to 100Mps with MIMO and OFDM technologies
• Range – Indoor 20 - 25 meters– Outdoor: 50 –100 meters
• Transmit power up to 100 mW
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Wireless Internet options: Bluetooth
• 1998: Bluetooth SIG : Ericsson, IBM, Intel, Nokia, Toshiba• A cable replacement technology• Max rate 700Kbps @2.4 Ghz• Range 10+ meters• Single chip radio + baseband
– at low power (1mw) & low price point ($5)• Convergence of 802.15 and Bluetooth in a single PAN
standard
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Cordlessheadset
Emerging Landscape
• Both 802.11 and Bluetooth will be used for access
• Complementary benefits
802.11 Bluetooth
LAN AP< 802.11b for PDAs< Bluetooth for LAN
access
New developments areblurring the distinction
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Which Internet access to choose?
• Most portables have multiple radio interfaces– 802.11, Bluetooth and 1xRTT supported on PDAs
• Dynamically select best access:– Lowest connection charge– Best reception– Best power budget (must save battery power)– Suitable Qos
• Challenges:– Seamless handoff (network, session)– Rate content adaptation if data rates are different
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“Vertical” Handoff between 802.11 and 1XRTTUCLA Project, 2003
US
Italy
BR
JP
Internet Internet
Dis
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Music download applicationSession synch points
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The 3rd Wave: Infrastructure vs Ad Hoc
Infrastructure Network (cellular or Hot spot)
Ad Hoc, Multihop wireless Network
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General Ad Hoc Network Characteristics
• Instantly deployable, re-configurable (No fixed infrastructure)
• Created to satisfy a “temporary” need• Node portability (eg sensors), mobility• Limited battery power• Multi-hopping ( to save power, overcome
obstacles, enhance spatial spectrum reuse, etc.)
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Ad Hoc Network Applications
Military– Automated battlefield
Civilian– Disaster Recovery (flood, fire, earthquakes etc)– Law enforcement (crowd control) – Homeland defense– Search and rescue in remote areas– Environment monitoring (sensors)– Space/planet exploration
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Ad Hoc Network Applications (cont)
Commercial– Sport events, festivals, conventions– Ad hoc collaborative computing (Bluetooth)– Sensors on cars (car navigation safety); sensors on cows– Networked video games at amusement parks, etc
Opportunistic ad hoc extensions (of Wireless Internet)– Indoor W-LAN extended coverage– Indoor network appliances (Bluetooth, Home RF)– Hot spots (Mesh Networks)– Campus, shopping mall, etc– Urban grid
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The Battlefield• DoD was first to understand the value of ad hoc
networks for the automated battlefield• In 1971 (two years after ARPANET), DARPA starts
the Packet Radio project• ONR (Office of Naval Research) sponsors
MINUTEMAN - a 5 year program at UCLA (2000–2005)
• Goal: develop an “unmanned” , airborne ad hoc architecture
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SURVEILLANCE MISSION
SURVEILLANCE MISSION
AIR-TO-AIR MISSION
STRIKE MISSION
FRIENDLY GROUND CONTROL
(MOBILE)
RESUPPLY MISSION
SATELLITE COMMS
Unmanned Control Platform
COMM/TASKING
COMM/TASKING
MannedControl Platform
COMM/TASKING
UAV-UAV NETWORK
Minuteman: Algorithms and Protocols for Network of Autonomous Agents
UAV-UGV NETWORK
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The MINUTEMAN “Internet in the Sky”
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Transferring Battlefield technology to civilian applications
Disaster recovery:• Flood, mud slide, eruption, chemical or nuclear
plant disaster• Several rescue teams involved, with different
functions• Autonomous vehicle swarms (ground/airborne)
are deployed (with sensors/actuators)• Manned and unmanned teams cooperate in
rescue• “Ad Hoc networking” will be central to make the
operation work