Data Aggregation and its Impact on Overall QoS of Lossy Wireless Sensor Network: A Survey

In Wireless sensor network, packet loss due to buffer overflow of sensor nodes and the delay caused due to retransmission of that lost packet is a major problem. So a big challenge is to improve the delay performance along with reliability of WSN. The goal of the proposed system is to broadcast sensed data to focus on delay performance. Also congestion at collector node due to duplicate sensed data in network is reduced by data aggregation, for this we compute a function at the collector node from the information gathered by spatially distributed sensor nodes. Because wireless sensor network applications require various levels of communication reliability (CR), the data transmission should satisfy the desired CR of the applications. Here, we propose a flexible loss recovery mechanism (called Active Caching) for sensor network applications with various CRs. The proposed scheme caches data packets at intermediate nodes over routing paths computed by CR to retransmit lost packets during multi-hop transmissions. DOI: 10.17762/ijritcc2321-8169.150516

Redundancy elimination for data aggregation in wireless sensor networks

In this bachelor thesis, design a robust and efficient data aggregation scheme that considers the unique characteristics of WSNs is designed. All used processes and techniques have been focused in the field of agriculture. In this thesis, a wireless sensor network with a data aggregation protocol in other to save energy is developed. MATLAB software is used to create the network and develop the protocol and its algorithms. The main goal of the work presented in this thesis has been to provide possible improvements for aggregation data and energy consumption in WSN applications. To achieve that, different existing techniques and algorithms are studied to devise a protocol by using some techniques, improving another techniques and implementing new concepts