A Guaranteed Lifetime Protocol for Real-Time Wireless Sensor Networks

Due to the stringent energy constraint wireless sensor nodes, network management cost for lifetime becomes one of the crucial issues in designing wireless sensor networks (WSNs). In such situation, guaranteed network lifetime is more preferred than unpredictable pro-long one. However, despite of its importance and necessity in real world deployment, few research works have been proposed to solve this complex problem by ideal approach with the lack of applicability. In this paper, we present a new centralized scheduling mechanism to guarantee notwork lifetime to a pre-determined time while maintaining k-coverage of network field. In order to guarantee network lifetime, each node are enforced to remain steadfast in the idle state for a known duration of its lifetime. In addition, the scheduling algorithm is extended to provide real-time service by adjusting transmission range according to current energy state of a sensor node. These two core functions are implemented by deciding each nodes role in the next round according to nodes energy consumption and active time history in decision phase. The performance of proposed scheme is compared with well-known A-MAC and MMSPEED protocols in terms of guaranteed lifetime and real-time respectively.