An Opportunistic Relay Protocol With Dynamic Scheduling in Wireless Body Area Sensor Network


Due to varying on-body channel conditions, transmission between a sensor node and a body-worn coordinator is vulnerable to poor channel conditions caused by body shadowing. One potential solution to the current is the employment of relays where direct transmission to the hub is not doable. The two-hop relay mechanism proposed in IEEE 802.fifteen.half-dozen commonplace will be divided into channel assessment, relaying node election, and information relaying processes. However, as these three processes are initiated at different time intervals, simulations counsel that channel conditions truly vary between processes, which results in information relaying failure. In order to scale back the likelihood of information relaying failure, a relay mechanism with predefined relaying nodes are introduced and evaluated against the relay mechanism proposed in IEEE 802.15.6 normal. A predefined relaying node will be active during the data relaying method even if it is not elected. Simulations show that the proposed relay mechanism is ready to attain fifty% reduction in knowledge relaying failure rate, that in flip improves the packet delivery rate (PDR). The proposed relay mechanism is evaluated in a superframe structure. Simulation shows that with the presence of the predefined relaying node, the network lifetime is extended by eight%. To further improve the PDR, direct transmission within the relaying process is supported, and a dynamic scheduling algorithm is proposed to optimize slot allocation within the superframe for all nodes. The proposed relay protocol achieves twenty one% improvements in network lifetime and 14% improvements in PDR with decreasing transmission powers from −ten to −15 dBm.

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