WIRELESS SENSOR NETWORK

A wireless Sensor network can be effectively used as a tool for gathering data in various situations provided it works with a large number of sensor nodes. It is desirable to make these nodes as cheap and energy-efficient as possible and rely on their large numbers to obtain high quality results. Network protocols must be designed to achieve fault tolerance in the presence of individual node failure while minimizing energy consumption. In addition, since the limited wireless channel bandwidth should be shared among all the sensors in the network, the protocols hired for these networks should be able to perform all the functions well and reduce the bandwidth requirements. One of the major issues in wireless sensor networks is developing an energy efficient routing protocol which has a significant impact on the overall lifetime of the sensor network. Therefore a communication protocol named LEACH (Low-Energy Adaptive Clustering Hierarchy) is proposed that partitions the networks into clusters and cluster nodes. LEACH is the first hierarchical cluster-based routing protocol for wireless sensor network which partitions the nodes into clusters, in each cluster a dedicated node with extra privileges called Cluster Head (CH) is responsible for creating and manipulating a TDMA (Time division multiple access) schedule and sending aggregated data from nodes to the BS where these data is needed using CDMA (Code division multiple access). Thus extends the lifetime. It is experimentally proven that this protocol works well in power minimization.

WIRELESS TECHNOLOGY

The widespread congestion in networking and security systems that works on wired cable

transmission has showed a great demand for the development of a technology that works on

removing these wanes. . So wireless technology was invented by which the advancement in the field of networking and communication arena took place.Wireless technology creates a network by sending 

radio-frequency signals between your computers to share information. It does not use any

wire and all the computers broadcast their information to one another using radio signals. Wireless solutions provide benefits by allowing users to access shared information, e-mail, and applications without the constraints of a wired connection. Further, wireless technology allows network managers to set up or augments networks without installing or moving wires. The major drawback is that wireless is a public frequency network therefore its interface is highly risky to be used for private information. These signals are even prone to disrupt by the infrared and radio signals. One of the major concerns surrounding wireless solutions is security. 

wireless security may be separted into two components:

1. authenticating wireless network users which ensure that only authorized users are on the network.
2. by encrypting data as it transfers between users and devices.                                                                            
   

    ADVANTAGES OF WIRELESS TECHNOLOGY:

   1. It is convient to use by user.It is used for radio programes, mobile phones i.e. BLUETOOTH  and computer network.

   2. No doubt wireless network is an amazing wireless technology which has totally changed the means of communication.

   3. It has become the significant option of any business because of its salient features like speed, security and mobility. The future of wireless technology is indeed bright. FIG 1.shows the example of mobility.
   
     
   

    

   FIG :1