THIẾT KẾ GIAO THỨC TRUYỀN BẢN TIN ĐIỀU KHIỂN HIỆU QUẢ NĂNG LƯỢNG VÀ TIN CẬY CHO MẠNG CẢM BIẾN KHÔNG DÂY

Abstract

A command delivery is a common operation and plays an essential role in
wireless sensor networks. This can be simply achieved if every node that receives a
command for the first time rebroadcasts the received command. However, it incurs
high energy consumption and unpredictable end-to-end message delay since
nodes must remain active. A slotted broadcast approach tackles these shortcomings
by using a distinct time slot to every node but decreases the reliability and does not
respond effectively to the dynamic networks. Our approach combines the
advantages of the two approaches where one sharable slot is allocated to each tree
level for competing and an on-the-fly mini-slot scheduling algorithm for scheduling
mini-slots to nodes at the same level is devised to further reduce the possibility of
message collision. Extensive simulation results proved that the approach improves
the reliability of message delivery and conserves the energy significantly, even
against the change of topology.