WSN Network architecture Sensor Network Scenarios- tamil

Описание: Basic scenarios in Wireless Sensor Networks
1. Types of sources and sinks
2. Single-hop versus multihop networks
3. Multiple sinks and sources
4. Three types of mobility (Node mobility, Sink mobility & Event mobility)

1. Types of sources and sinks • Sources: Any node that provides data/measurements or the actual nodes that sense data. • Nodes where information is generated • Sinks: Nodes where information is required • These sinks sometimes are part of the sensor network itself . • Sometimes “outside” the network (e.G. The firefighter’s PDA communicating with a WSN). • Is part of an external network (e.G., Internet), somehow connected to the WSN • The sink is not interested in the detection of parameters like source node; • In sink data itself is much more important. Source Sink Inte rnetSink Source Sink Source
7. 2.Single-hop vs. multi-hop networks • The simple, direct communication between source and sink is not always possible, specifically in WSNs, • Which are intended to cover a lot of area/ground (Exp. In environmental or agri- culture applications) or • That operate in difficult radio environments with strong attenuation (exp. In buildings). • One common problem: limited range of wireless communication • Essentially due to limited transmission power, path loss, obstacles
8. Multi-hop Networks • Option: multi-hop networks • Send packets to an intermediate node & Intermediate node forwards packet to its destination • Multi hopping is an evident and working solution to overcome problems with large distances or obstacles, • It has also been claimed to improve the energy efficiency of communication. • Great care should be taken when applying multihopping with the end of improved energy efficiency. • It should be pointed out that only multihop networks operating in a store and forward fashion are considered here. In such a network, a node has to correctly receive a packet before it can forward it somewhere. Source Sink Obstacle
9. 3.Multiple Sinks, Multiple Sources • In many cases, there are multiple sources and multiple sinks present. • In the most challenging case, multiple sources should send information to multiple sinks, • where either all or some of the information has to reach all or some of the sinks.
10. 4.Three Types of Mobility • In the scenarios discussed above, all nodes were stationary. • But one of the main features of wireless communication is its ability to support mobile nodes. 1. Node mobility 2. Sink mobility 3. Event mobility
11. Node mobility • The wireless sensor nodes themselves can be mobile. • The meaning of such mobility is application dependent. • Examples like environmental control, node mobility should not happen • The network has to reorganize frequently enough to be able to function correctly. • It is clear that there are trade-offs between the frequency and speed of node movement on the one hand • The energy required to maintain a desired level of functionality in the network on the other hand.
12. WSN Sink Mobility Request Movement direction Propagation of answers

EC8702 AD HOC AND WIRELESS SENSOR NETWORKS

Unit-1
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UNIT-2
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UNIT-3


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