2.1 Classification of WSNs:
Wireless sensor networks (WSNs) are employed to be beneficial in diverse applications in dissimilar environment. Sensing nodes differ in their technical requirement to be beneficial in these various applications. Some networks require specific sensors to be developed and deployed for some inaccessible applications; subsequently sensors can be present with different and common properties for different applications. For example one application can use randomness in distribution of nodes while other application can use static distribution.
Hence, the network can be classified based on the strategy of deployment and this categorize the wireless sensor network.

2.1.1 Single-hop and multi-hop networks:
The network can …show more content…
In aggregating networks the information is not transmitted directly to the base station but uses packet forwarding and intermediate sensors needs to reach base station, although in non-aggregating network all the information is transmitted directly to the base station. Mainly in large networks it is preferable to perform aggregation rather than non-aggregation.
In wireless sensor networks usually the density of nodes remains high, hence it is valuable to consider aggregating network. It is also very efficient in large area of network in spite of non-aggregating network for data transmission.
Aggregating networks transmits only the compact and non-redundant information to the base station. Thus, it improves performance of the network when the data count is high. In aggregating networks the network traffic is also reduced to much extent by balancing the amount of data and reducing the number of transmission to the base station.
The preference for aggregating network increases as the size of the network increases because the network traffic is proportional to the size and density of the network over non-aggregating network for improved