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Ad Hoc Wireless Networks

Nodes communicate with each other Willing to forward packets Diameter = minimum number of hops is small (10-20) and often is >5 Packets may be lost and corrupted Nodes may move w/o notice or continuously speed << package transmission latency Bi-(uni-)directional links

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Ad Hoc Wireless Networks

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  1. Nodes communicate with each other Willing to forward packets Diameter = minimum number of hops is small (10-20) and often is >5 Packets may be lost and corrupted Nodes may move w/o notice or continuously speed << package transmission latency Bi-(uni-)directional links Single ID = IP address/sequential number Battery power supply Modes = sleep/stand by/listening/transmitting Ad Hoc Wireless Networks

  2. Table-driven routing = Proactive = Link-State consistent and up-to-date routing information to all nodes is maintained at each node whereas = Global View DSDV = Dynamic Destination-Sequenced Distance-Vector Every mobile station maintains a routing table that lists all available destinations, the number of hops to reach the destination and the sequence number assigned by the destination node Cluster-Based On-demand routing = Reactive = Distance Vector routes are created only when desired by the source host DSR = Dynamic Source Routing TORA = Temporally Ordered Routing Algorithm AODV = Ad hoc On-demand Distance Vector Two Types of Ad Hoc RP

  3. Route Discovery Route Reply = Backward Tracing Route Maintenance Error handling Main Tasks in AHRP

  4. Route Discovery

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