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Wsn topologies intro


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General Introduction for WSN and its Topologies

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Wsn topologies intro

  1. 1. 1 Applications of Wireless Sensor NetworksVarious fields of applications of wireless sensor networks are : • Environment Monitoring • Acoustic Detection • Seismic Detection • Military Surveillance • Inventory Tracking • Medical Monitoring • Smart Spaces • Process Monitoring • Green House Monitoring • Landslide Detection • Machine Health Monitoring • Water Monitoring • Agriculture Sector • Medical Sector 1.1 Advantages of WSN Advantages of WSN are : • Implementation cost is cheaper than wired network. • Ideal for temporary network setups. • Ideal for the non reachable such as across river or mountains or rural areas. 1
  2. 2. 1.2 Disadvantages of WSN Various disadvantages of WSN are :• Lower speed compared to wired network.• Less secure because hacker’s laptop can act as acess point.• More complex to configure than wired network.• Can be affected by surrounding’s. For example, walls(blocking), mi- crowave oven(interference), far distance.• Sensor node has low battery power, so as battery goes down, node goes down and so does the whole network. 2 Advantages and Disadvantages of Sensor Net- work Topology All topologies have various advantages and disadvantages :• Ring : In this topology, one node failure causes whole network failure and also messages can travel only in one direction. Advantage is that each node is equal and no node is leader.• Star : In this topology, if hub is damaged the whole network is dam- aged. Advantage is that if one node is cut of there is no effect on another node.• Bus : In this topology, there is no retransmitting capacity for each node. Advantage is that it is very simple to implement.• Tree : In this topology, if root node is damaged then whole network is damaged. Advantage is that we can add priority according to structure or posi- tion of nodes.• Fully Connected : In this topology, implementation is difficult and also routing problem is there if there is increase in network. Advantage is that direct communication is achievable and all nodes are identical.• Mesh : In this topology, it can only be expanded with the same number of nodes in both direction as it is having a square relation between the 2
  3. 3. nodes.Advantage is that all nodes have equal priority and are identical. Ifone node is damaged another node takes on the responsibility. It isgood for large scale network over a geographical region.3 ConclusionWireless sensor networks already has huge application in various sec-tors and fields inspite of some limitations one of which is ’low batterypower capacity’ which is also its main drawback. Still its applicationsare increasing day by day. Also a thing to keep a check on in sensorsapplications is its topology. We have various options and every topol-ogy is having Pros and Cons.The applications of WSN will increase in near future and its draw-backs will hopefully reduce significantly as lot of research is goin onboth internationally and at domestic level in this field. 3