A Survey on Delay-Aware Network Structure for Wireless Sensor Networks   with Consecutive Data Collection Processes
  A Wireless Sensor Network (WSN) consists of spatially distributed autonomous sensors to monitor physical or environmental conditions, such as temperature, sound, pressure,etc. In sensing applications, data packets are flowing from sensor nodes to base station. In data collection processes, bottom up approach is used. In bottom up approach, all nodes send their sensed data packets to base station directly. In this approach will lead to increased delay, which will lead to higher energy consumption. To reduce the energy consumption of sensor nodes,Clustering Algorithm and Low-Energy Adaptive Clustering Hierarchy (LEACH) are being used. Efficient gathering in Wireless Sensor information systems, Power Efficient Gathering in Sensor Information System (PEGASIS) is being used. There are lot of research issues in Wireless Sensor Networks such as delay, lifetime of network, energy dissipation which needs to be resolved. 
Ms.Aruna.G.R, Mr.SivanArulSelvan
cs.NI