Recent Network Technologies and its Advanced Applications

Recently, sensor databases have been used for many applications such as environment observations or weather forecasting. To construct sensor databases, some researches focus on the rounding sink approach. In the approach, rounding sinks repeatedly round in the area that sensors are deployed and collect data from each sensor. Compared with the traditional wireless sensor network approach, the rounding sink approach can reduce communication traffic since rounding sinks collect sensor data directly from sensors. Some data collection protocols to improve the effectiveness of the data collection by rounding sinks have been proposed, but they do not consider the data amount that each sensor has. Here, a problem occurs. Rounding sinks collect only a few data from a sensor even if it has many sensor data. In this paper, we propose a data collection protocol considering the data amount that each sensor has. In our proposed protocol, a rounding sink polls neighboring sensors and gets the data amount that the polled sensor has. Then, the rounding sink calculates the upper limit for the data amount to collect and collects the data up to the limit. We confirmed that our proposed protocol can give fairness to the amount of collected data.