Bilkent University
Department of Computer Engineering

Power Efficient Data Gathering and

Aggregation in Wireless Sensor Networks


Hüseyin Özgür Tan  

Master Thesis Presentation

 Supervisor: Asst. Prof. Dr. İbrahim Körpeoğlu


Recent developments in processor, memory and radio technology have enabled wireless micro-sensor networks which are deployed to collect useful information from an area of interest. The sensed data must be gathered and transmitted to a base station where it is further processed for end-user queries. Since the network consists of low-cost nodes with limited battery power, power efficient methods must be employed for data gathering and aggregation in order to achieve long network lifetimes.

In an environment where in a round of communication each of the sensor nodes has data to send to a base station, it is important to minimize the total energy consumed by the system in a round so that the system lifetime is maximized. With the use of data fusion and aggregation techniques, while minimizing the total energy per round, if power consumption per node can be balanced as well, a near optimal data gathering and routing scheme can be achieved in terms of network lifetime.

So far, different routing protocols have been proposed to maximize the lifetime of a sensor network. In this thesis, we propose two new algorithms under name PEDAP (Power Efficient Data gathering and Aggregation Protocol), which are near optimal minimum spanning tree based routing schemes, where one of them is the power-aware version of the other. Our simulation results show that our algorithms perform well both in systems where base station is far away from and where it is in the centre of the field.



DATE: January 20, 2003, Tuesday @ 16:00