In Wireless Sensor Networks (WSNs), sensor nodes are generally placed in different geographical locations. The sensor nodes collect data from environment and they react based on the received query requests. It is a great challenge for sensor nodes to send data periodically to the sink node in a conflict-free way. For this, authors present a Conflict-free Periodic Data Aggregation (CPDA) technique in WSNs. CPDA also works in heterogeneous environment where some of the sensor nodes in a network suffer from less amount of energy. The authors have also presented a mathematical model for the proposed data aggregation technique. The simulation results indicate that CPDA technique works well as compared with the existing approaches. The simulation results of CPDA technique are validated through NS-2 simulations.

在无线传感器网络 (WSN) 中，传感器节点通常放置在不同的地理位置。传感器节点从环境中收集数据，并根据收到的查询请求做出反应。传感器节点以无冲突的方式周期性地向汇聚节点发送数据是一个很大的挑战。为此，作者提出了 WSN 中的无冲突定期数据聚合 (CPDA) 技术。CPDA 还可以在异构环境中工作，在这种环境中，网络中的某些传感器节点受到的能量较少。作者还为所提议的数据聚合技术提供了一个数学模型。仿真结果表明，与现有方法相比，CPDA 技术运行良好。通过NS-2仿真验证了CPDA技术的仿真结果。