The IEEE 802.15.4/ZigBee protocols embody promising technologies
for WSNs, but are still ambiguous on how to efficiently build
synchronized multiple-cluster networks, specifically for the case
of cluster-tree topologies and mesh topologies. In fact, the
current IEEE 802.15.4/ZigBee specifications restrict the
synchronization to beacon- enabled (by the generation of periodic
beacon frames) star networks, while they support multi-hop
networking in mesh topologies, but with no synchronization. Quality
of service (QoS) requirements can be satisfied in star based
topologies using the Guaranteed Time Slots (GTS) feature of the
IEEE802.15.4 standard, GTS communications in multi hop scenarios
are currently limited by IEEE802.15.4 beacon scheduling designs.
This restricts applications to run over sensors that are within
radio range of the network coordinator. In this work, proposals are
made for successful data transmission in multihop chain network.
Throughput, efficiency and duty cycle are analyzed for each
proposals made and finally their advantages and disadvantages are
summarized at the end in conclusion
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