Design of an Efficient Message Collecting Scheme for the Slot-Based Wireless Mesh Network

摘要

This paper proposes an efficient message collection scheme for wireless mesh networks and measures its performance. Built upon the WirelessHART protocol providing a slot-based deterministic network access as well as the split-merge operation capable of switching channels within a single slot, the proposed scheme allocates two consecutive slots to each pair of child nodes for a receiver. In addition to the primary sender, the secondary sender tries to send a message, if it has, after the predefined interval (additional transmit), while the receiver selects the frequency channel bound to each sender according to the clear channel assessment result in a single slot (additional receive). The simulation result, obtained from the discrete event scheduler targeting at the 4-level binary tree topology, shows that the proposed scheme can improve the message delivery ratio by up to 35.4% and reduce the wasteful transmission by up to 38 % for the given slot error ranges, compared with the non-switching scheme.