Underwater acoustic network MAC access method

Abstract

The invention relates to an underwater acoustic network MAC access method. The method comprises the following steps: when a data packet needs to send, a source node omni-directionally sends a reservation request control packet RTS with the maximum powder, after receiving the RTS, all nodes in the source node radiation range compute respective signal-to-noise ratio relative to the source node, and compute the azimuth angle and elevation angle of the resource node relative to all nodes; after receiving the first RTS, a destination node waits the time duration W, selects the node with the maximum theta value as a communication node, and omni-directionally broadcasts the reservation confirming data packet CTS; the node receiving the CTS computes the direction and signal-to-noise ration of the destination node relative to itself, establishes a channel state matrix H and a neighbor node direction matrix L; the node in the relay selection region computes the own mean value relative to the source node and destination node signal-to-noise ratio after acquiring that one source node sends the request but the request is not agreed by the destination node through the RTS and the CTS, when the mean value is greater than one threshold, the node takes charge of the relay node.

Description

technical field [0001] The invention relates to a MAC protocol design method in an underwater sensor network. Background technique [0002] In recent years, Underwater Acoustic Sensor Networks (UASNs) has become one of the new research hotspots. The application of UASNs has promoted the research on the marine environment, and is of great significance to the fields of economy, scientific research, and military affairs. However, at present, only slow acoustic waves can be used for effective communication in seawater, so underwater acoustic communication has the characteristics of long delay and low bandwidth. Due to the existence of long delay, the data packet sent by the node farther away from the destination node always arrives later. If other data packets have arrived at the destination node at this time, the destination node will delay forwarding the data packet that arrives later, or even not Forward. This characteristic severely reduces the fairness of underwater acou...

AI Technical Summary

Problems solved by technology

[0003] In the existing MAC access method of underwater acoustic communication, the nodes all communicate omnidirectionally——the communication range of the node is a sphere, which makes it cause interference to multiple other neighbor nodes when the node communicates with one neighbor node, making it unable to normal communication

Due to the sparse deployment of underwater nodes and the limited acoustic spectrum resources available, this communication method severely reduces the network throughput.

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