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INTRODUCTION TO AD HOC WIRELESS NETWORKS

contents. Taxonomy of networksCategoies of wireless network Ad-hoc networkCharacteristics of ad-hoc networkApplication of ad-hoc networkSensor networksCharacteristics of sensor networkApplication of sensor networkLmitation of ad-hoc and sensor networks. What is network? . Network:Network i

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INTRODUCTION TO AD HOC WIRELESS NETWORKS

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    1. 2/12/08 1 Seminar on Wireless Ad Hoc & Sensor Networks

    2. contents Taxonomy of networks Categoies of wireless network Ad-hoc network Characteristics of ad-hoc network Application of ad-hoc network Sensor networks Characteristics of sensor network Application of sensor network Lmitation of ad-hoc and sensor networks

    3. What is network? Network: Network is series of points or nodes Interconnected by communication paths Network can interconnect with other netowrks contains subnetworks

    4. Taxonomy of wireless networks wireless networks fixed mobile access ad hoc networks networks networks cellular random wireless sensor networks access internets networks networks

    5. Categories of wireless networks Cellular (one hop) networks Wireless ad hoc (multi hop)networks. Wireless Sensor Networks 5/02/09 5 Seminar on Wireless Ad hoc & Sensor Networks

    6. Cellular Networks Cellular Networks Networking Wireless Hosts Infrastructure dependent High setup costs Large setup time Reliable 6

    7. What is Ad-hoc? A local area network, or some small networks, parts are time-limited, and only usable for the duration of a communication session The routers are free to move randomly, organize themselves arbitrarily The wireless topology vary rapidly and unpredictably 05/02/09 7 Seminar on Wireless Ad hoc & Sensor Networks

    8. A wireless ad hoc network 8

    9. IEEE 802.11 in OSI Model 9

    10. 802.11 Architecture of an ad-hoc network 05/02/09 10 Seminar on Wireless Ad hoc & Sensor Networks

    11. Dynamic network topology The mobile nodes are free to move randomly and organize themselves arbitrarily; thus, the network's wireless topology may change rapidl and unpredictably. 05/02/09 11

    12. What are ad hoc/sensor networks? Sometimes there is no coverages remote areas, ad hoc meetings, disaster areas cost can also be an argument against an infrastructure Sometimes not every station can hear every other station Data needs to be forwarded in a multihop manner 05/02/09 12 Seminar on Wireless Ad hoc & Sensor Networks

    13. Advent of Ad hoc Wireless Networks(Cont)

    14. 14 Comparisons between Cellular and Ad Hoc Wireless Networks (I)

    15. 15 Comparisons between Cellular and Ad Hoc Wireless Networks (II)

    16. Mobile Ad hoc Networks mobile hosts multi-hop routes between nodes may not use infrastructure 16

    17. Motivation Ad-hoc nodes are typically battery powered and may not support energy scavenging Node and network lifetime must be prolonged Most energy consumption is at the nodes transceiver Minimum transmit power decreases contention Higher number of simultaneous transmissions can be allowed Increase in Capacity 17

    18. Motivation (Cont) wireless networks have special limitations and properties such as limited bandwidth, highly dynamic topology, link interference, limited range of links, and broadcast. 18

    19. Characteristics and tradeoffs Characteristics Self-organized Self-deployed Decentralized Dynamic network topology Tradeoffs Limited Bandwidth Need Multi-hop router Energy consumption problem Security problem 19

    20. Characteristics of MANETs Dynamic topology links formed and broken with mobility Possibly uni-directional links Constrained resources battery power wireless transmitter range Network partitions 20

    21. Limitations of MANET Power: network life limited by battery life Short radio range Packet Collisions Network topology changes Address allocation 21

    22. Mobile Ad Hoc Networks (MANET) 4/10/08 22 One day Workshop on Wireless Ad Hoc Networks

    23. Broadcasting Unlike wired network, every hop is broadcasting Every packet can reach every node in the radio range of the sender Flooding messages make the problem even worse Wasted bandwidth High collision rate 23

    24. Applications Personal area networking Cell phone, laptop, PDA , tablet pc Meeting room/conference Emergency operations Search and rescue(Disaster &Relief) Policing and fire fighting Civilian environments Taxi cab network Boats, aircrafts Military use On the battle field 24 Military applications Ad hoc wireless networks is useful in establishing communication in a battle field. Collaborative and Distributed Computing A group of people in a conference can share data in ad hoc networks. Streaming of multimedia objects among the participating nodes. Emergency Operations Ad hoc wireless networks are useful in emergency operations such as search and rescue, and crowd control. A Wireless Mesh Network is a mesh network that is built upon wireless communications and allows for continuous connections and reconfiguration around blocked paths by "hopping" from node to node until a connection can be established. Military applications Ad hoc wireless networks is useful in establishing communication in a battle field. Collaborative and Distributed Computing A group of people in a conference can share data in ad hoc networks. Streaming of multimedia objects among the participating nodes. Emergency Operations Ad hoc wireless networks are useful in emergency operations such as search and rescue, and crowd control. A Wireless Mesh Network is a mesh network that is built upon wireless communications and allows for continuous connections and reconfiguration around blocked paths by "hopping" from node to node until a connection can be established.

    26. Layers in Use Ad-hoc networks link layer: medium access control network layer: routing transport layer: TCP/IP 26

    27. NETWORK LAYETRS:

    28. Ad-hoc routing protocols 05/02/09 AODV: Ad-hoc On-Demand Distance Vector Routing LMR: Lightweight Mobile RoutingTORA: Temporally-Ordered Routing Algorithm ABR: Associatively-Based Routing SSR: Signal Stability Routing DSR: Dynamic Source Routing Table Driven:DSDV: Destination-sequenced Distance-vector Routing CGSR: Cluster-head Gateway Switch Routing WRP: Wireless Routing Protocol AODV: Ad-hoc On-Demand Distance Vector Routing LMR: Lightweight Mobile RoutingTORA: Temporally-Ordered Routing Algorithm ABR: Associatively-Based Routing SSR: Signal Stability Routing DSR: Dynamic Source Routing Table Driven:DSDV: Destination-sequenced Distance-vector Routing CGSR: Cluster-head Gateway Switch Routing WRP: Wireless Routing Protocol

    29. functional diagram of a wireless sensor communication node.

    30. IEEE 802.11 in OSI Model

    31. CHARACTERISTICS OF WIRELESS SENSOR NODES AND NETWORKS Batteries in an ad hod network can be recharged, while they are not replaceable in wireless sensor networks. The goal of a wireless sensor network is to prolong battery life at the expense of QoS and bandwidth utilization [7], whereas the objective of an ad hoc network is to provide QoS. 05/02/09

    32. Applications

    34. Wireless Sensor Networks (WSN)

    35. 7 Comparisons between Cellular and Ad Hoc Wireless Networks (I)

    36. Comparisons between Cellular and Ad Hoc Wireless Networks (II)

    37. CONCLUSION

    38. FUTURE? Ad hoc Wireless Network Everywhere Seminar on Wireless Ad hoc & Sensor Networks 38 05/02/09

    39. Thanks 05/02/09 39 Seminar on Wireless Ad hoc & Sensor Networks

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