lec-10-adhoc

lec-10-adhoc - AdHocNetworks,Routingand Security...

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Shambhu Upadhyaya 1 Ad Hoc Networks, Routing and  Ad Hoc Networks, Routing and  Security Security Shambhu Upadhyaya Wireless Network Security CSE 566 (Lecture 10)
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Shambhu Upadhyaya 2 Introduction Two basic groups of ad-hoc networks: - Networks of mobile computers  - Wireless sensor networks Basic characteristic:  Ability to establish network communication between hosts  without any infrastructure - The most significant advance compared to classic fixed systems - Reveals a very large scale of new possibilities
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Shambhu Upadhyaya 3 Ad-hoc Fundamentals Ad hoc networks are autonomous networks  operating either in isolation or as “stub networks”  connecting to a fixed network Do not necessarily rely on existing infrastructure No “access point” Each node serves as a router and forwards packets  for other nodes in the network Topology of the network continuously changes
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Shambhu Upadhyaya 4 Ad-Hoc Fundamentals Characteristics - Dynamic topology: Nodes are free to move arbitrarily within  the network (or leave and join the network) causing random  topology changes which can happen rapidly at unpredictable  times. Packets are very likely routed over multiple hops - Variable capacity links: Significantly lower link capacities  compared to traditional hardwired links. High mobility -> low  link capacity and vice versa - Congestion: More like a rule than exception - Energy-constrained mobile nodes: Nodes usually operate on  batteries -> all operations must be optimized for energy  conservation - Weakened physical security: More prone to physical threats  than hardwired networks
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Shambhu Upadhyaya 5 Motivation Must support mobility Avoids single point of failure typical of centralized  systems Often unable to rely on existing communications  infrastructure Desire for a rapidly deployable, self -organizing  network Multi-hop packet routing used to exchange  messages between users who are not within LOS of  each other
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Shambhu Upadhyaya 6 Why Ad-hoc networks? Setting up of fixed access points and backbone infrastructure is not always  viable - Infrastructure may not be present in a disaster area or war zone - Infrastructure may not be practical for short-range radios; Bluetooth  (range ~ 10m) Ad hoc networks: - Do not need backbone infrastructure support - Are easy to deploy - Self-configure - Useful when infrastructure is absent, destroyed or impractical
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Shambhu Upadhyaya 7 Challenges Limitations of the Wireless Network Packet loss due to transmission errors Variable capacity links Frequent disconnections/partitions Limited communication bandwidth Broadcast nature of the communications Limitations imposed by Mobility
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lec-10-adhoc - AdHocNetworks,Routingand Security...

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