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