Wireless Ad Hoc Networks Mario Gerla CS 215, Winter 2001Cellular vs MultihopGeneral Ad Hoc Network CharacteristicsAd Hoc Network ApplicationsSlide 5Ad Hoc, Personal Networking with BluetoothSlide 7Slide 8Slide 9Subscriber DeviceNetwork ArchitectureSlide 12Slide 13Slide 14Wireless Ad Hoc NetworksMario GerlaCS 215, Winter 2001• Introduction to Ad Hoc networks• Protocol Stack• Physical and MAC Layer• ClusteringCellular vs MultihopStandard Base-Station Cellular Networks Ad Hoc, Multihop wireless NetworksGeneral 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 battlefieldUAV NetworkBattlefield: 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 Bluetoothheadsetcell phonestoragepalmtopPDABluetooth Network – Piconetmasterslave 1slave 2slave 3•Piconets created ad-hoc•Master-Slave concept•Piconets defined by itsfrequency hopping sequenceslavemastermaster/slaveMultiple 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 devicesSubscriber DeviceNetwork Architecture2.3 GHz900 MHzModemWired Access PointPoletopRadio2.4 GHzHigh-speed dedicatedwired connectionsInternet and Corporate NetworksNetwork