A MAC Protocol Generation Method for Underwater Acoustic Network Based on State Coloring

Abstract

The present invention relates to a kind of MAC protocol generation method of underwater acoustic network based on state coloring, which comprises constructing the local layered graph: specifying a layer for each node in UANs according to the number of hops from the node to the sink to obtain the layered topology graph, and according to The control information received by the node builds a local one-hop neighbor table for each sensor node, and builds a local layered map for each sensor node through the local one-hop neighbor table of each sensor node; builds a local layered coloring map: by listening The data packet or ACK frame header information in the channel judges the node status and divides the nodes in the local layered graph into multiple color colors to obtain the local layered coloring graph of each node; according to the local layered coloring graph of each node in Data transmission is carried out when the data transmission conditions are met. The invention avoids the generation of conflict through the local layered coloring map, effectively avoids the conflict without the RTS / CTS handshake mechanism, reduces control packets, reduces energy consumption, and improves channel utilization.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic network sensing, in particular to a method for generating a MAC protocol of an underwater acoustic network based on state coloring. Background technique [0002] In recent years, Underwater Acoustic Networks (UANs) have broad application prospects in research fields such as oceanographic data collection, underwater rescue, environmental monitoring, tactical surveillance, and resource discovery. In UANs, radio waves can only be transmitted over a long distance in the range of extremely low frequencies (30-300 Hz), and super antennas and high transmission power are required; at the same time, radio waves are greatly scattered in water. Therefore, due to the particularity of the underwater environment, UANs mostly use sound waves for communication. However, the propagation speed of sound waves under water is only about 1500m / s, which is 3×10 times faster than that of radio waves in radio...

AI Technical Summary

Problems solved by technology

However, clock synchronization is a difficult problem in UANs, and the long time slot division causes a great waste of limited underwater bandwidth.

Before each data transmission, a series of handshakes are required, and only one set of data is transmitted at the same time. The handshake between nodes not only increases energy consumption, but also prolongs the average delay of data transmission

Another proposed R-MAC is a reservation-based Mac protocol, which can avoid conflicts without the RTS / CTS handshake mechanism, but also requires control packets such as ND, ACK-ND, and SYN to avoid conflicts, and uses complex The scheduling algorithm avoids conflicts. If in mobile UANs, the estimation error of propagation delay is very large, so it is only suitable for static networks or networks with little mobility

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