Query-Driven Tracing for a Multiuser Scenario in Wireless Sensor Networks

In a multiuser scenario of wireless sensor networks (WSNs), the monitored region is generally large-scaled with a varied number of queries from many users. These queries take on some characteristics, such as the non-uniform users´ interests on time and event types. For the large number of queries, the NERMQ mechanism that we previously proposed worked very well. In the NER-MQ a special subnetwork, the embedded network (EN), is employed. The EN can restrict the distribution of queries within the event region. In this paper, the non-uniform queries are considered for the multiuser scenario. To reduce the energy consumption for event tracing when there are few arrivals of queries, we propose an approach called the query-driven tracing (QDT) based on the NER-MQ to dynamically treat the event tracing according to the number and density of queries. The motivation of the approach is to save the energy unnecessarily consumed when there are few arrivals of queries in the NERMQ. Simulation results show that the proposed QDT approach can work effectively for the multiuser scenario in WSN.