Abstract
Wireless sensor networks with the mobile sink can help to prevent the hot-spot problem and improve the network lifetime. However, in practice, the trajectories of the sink can not ideally change due to the obstacle of the environment or the requirement of the application. The constraint on trajectory of the mobile sink causes the different connection time between the mobile sink and the sensor node, which might result in the imbalance depletion of energy. We propose here an efficient data gathering policy to jointly consider the constrained mobility of the sink and the different connection time at the sensor node. The policy increases the network lifetime in wireless sensor networks with path-constrained mobile sink by optimizing the assignment sensor node. In addition, we also propose the policy to cope with the overlapped connection time of the sink and sensor node due to the movement of the sink. The simulation results demonstrate the effectiveness of the proposed policy: by carefully considering the trajectory of the sink and effectively assigning the sensor node, the network lifetime is increased.
Highlights
As a promising technology for connecting smart object to create the new Internet of Things, wireless sensor networks (WSNs) have been widely deployed in many potential applications such as environmental monitoring, security, surveillance, plant automation, and control emergency response [1]
We show that maximizing network lifetime is equivalent to balancing the transmission rate of sensor nodes (Section 3)
The mobile sink with constrained path has been widely considered in WSNs to improve the network lifetime
Summary
As a promising technology for connecting smart object to create the new Internet of Things, wireless sensor networks (WSNs) have been widely deployed in many potential applications such as environmental monitoring, security, surveillance, plant automation, and control emergency response [1]. As the sink traverses the networks, the hot-spot nodes will be distributively changed over the time, and the energy consumption around the sink spreads among the sensor nodes which helps to improve the network lifetime [5]. Since there is no mechanism to control the amount of traffic forwarded to the sink, this policy is unable to balance the energy consumption among the sensor nodes so as to prolong the network lifetime. In WSNs with path-constrained mobile sink, the connection time between the sink and the sensor nodes is different which results in different transmission rate at the sensor node. We propose the novel data gathering policy for mobile sink with predetermined trajectory We consider both traffic load and connection time as metric for modeling the network lifetime. It can cope with high speed of the mobile sink (Section 7)
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