Adaptive weighted scheme for improving mobile sensor node connectivity in IEEE 802.15.4 networks

Conventional IEEE802.15.4 wireless sensor network is suitable for fixed sensor nodes. However, there are some issues with mobile sensor nodes joining or leaving the sensor network since the mobile sensor node is easier to lose its connectivity compared to the fixed sensor nodes. In order to regain its connectivity, the mobile sensor nodes must spend more time and energy to perform the re-association procedure, resulting in an efficiency decay of the sensor network. To solve this problem, we refer to the previous research to design an adaptive weighted link quality indicator prediction based scheme in the media access layer. The proposed scheme can reduce the non-connectivity time of mobile sensor node by early performing the re-association procedure. Additionally, we design a simple procedure to lessen the Ping-Pong effect problem without additional computation overhead, thereby improving stability of the connection between the mobile sensor node and its corresponding coordinator.