Wireless Ad Hoc Networks Mario Gerla CS 215, Winter 2001 Introduction to Ad Hoc networks Protocol Stack Physical and MAC Layer Clustering.

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Presentation transcript:

Wireless Ad Hoc Networks Mario Gerla CS 215, Winter 2001 Introduction to Ad Hoc networks Protocol Stack Physical and MAC Layer Clustering

Cellular vs Multihop Standard Base-Station Cellular Networks Ad Hoc, Multihop wireless Networks

General Ad Hoc Network Characteristics Instantly deployable, re-configurable infrastructure Node mobility Heterogeneous nodes (big/small; fast/slow etc) Heterogeneous traffic (voice, image, video, data) Limited battery power Multihopping ( to save power, overcome obstacles, enhance spatial spectrum reuse, etc.)

Ad Hoc Network Applications Disaster Recovery (flood, fire, earthquakes etc) Law enforcement (crowd control, border patrol, etc.) Search and rescue in remote areas Sport events, festivals Ad hoc collaborative computing (Bluetooth) Indoor network appliances (Bluetooth, HomeRF) Mobile access to Internet (Metricom) Sensor networks (e.g., to replace mine fields) Automated battlefield

UAV Network Battlefield: the Warfighter’s Information Network (WIN) How does the network perform as it is scaled to 100,000+ heterogeneous devices? OSPF, FishEye, or DAWN, routing?

Ad Hoc, Personal Networking with Bluetooth headset cell phone storage palmtop PDA

Bluetooth Network – Piconet master slave 1 slave 2 slave 3 Piconets created ad-hoc Master-Slave concept Piconets defined by its frequency hopping sequence

slave master master/slave Multiple Piconets: Ad Hoc Scatternet

Current modems  External with rechargeable battery with 6-8 hour battery life Sierra Wireless and Novatel Wireless will provide internal card modems in early 2001 R&D underway on chipset for computer motherboards and other user devices Subscriber Device

Network Architecture 2.3 GHz 900 MHz Modem Wired Access Point Poletop Radio 2.4 GHz High-speed dedicated wired connections Internet and Corporate Networks Network Interface Facility