tk-coverage: Time-Based K-Coverage for Energy Efficient Monitoring

K-coverage is a classic issue in wireless sensor network (WSN) deployment. Existing works typically assumes that every position in the monitoring field is covered by at least k sensor nodes at any given time. This may not always be necessary because certain events to be monitored will last only for a short period of time. Based upon such observation, we include the time dimension in the original k-coverage problem, and denote it as tk-coverage In the context of tk-coverage, sensor nodes can apply periodical sleeping strategies to save energy use. A corresponding tk-coverage (TKC) model is proposed to analyze the energy consumption and detection delay., The proposed tk-coverage can balance energy consumption and detection delay by adjusting the sleeping strategies of sensor nodes. Comprehensive simulations have been conducted to validate the effectiveness and demonstrate the efficiency of this solution.