A Method of Underwater Acoustic Media Access Control Based on Reservation Scheduling Mechanism

Abstract

The invention provides a hydroacoustic media access control method based on a reservation scheduling mechanism. After a fixed node with a data transmission requirement receives an ND packet of a Sinknode, an RTS packet is sent to the Sink node for carrying out data transmission reservation; and the Sink node calculates information of propagation delay and the like according to information in theRTS packet, and then calculates data transmission time of each node, so that data transmission scheduling of each node is completed. The conflict problem of the data packets is effectively avoided based on the reservation scheduling mechanism, the handshaking time between the nodes is shortened, the channel utilization rate is obviously improved, and the data transmission efficiency is improved; and in addition, the nodes do not need to be subjected to time synchronization in advance, so that the implementation requirements of a hydroacoustic communication network are remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic communication, in particular to an access control method for underwater acoustic media based on a reservation scheduling mechanism. Background technique [0002] Different from the use of electromagnetic waves as a carrier for information transmission on land, acoustic communication is more often used in the ocean, and underwater acoustic communication is currently the only way to achieve long-distance underwater information transmission. However, acoustic waves have inherent characteristics such as slow propagation speed and low frequency, which makes a huge difference between underwater acoustic communication and electromagnetic wave communication. The Media Access Control (MAC) protocol belongs to the data link layer protocol, and is used to solve the problem of how to allocate the channel usage right when the shared channel in the network competes. Currently, the commonly used MAC...

AI Technical Summary

Problems solved by technology

The currently commonly used underwater acoustic communication MAC protocol is generally based on the random access mechanism and the handshake mechanism. The former is prone to conflicts when multiple nodes send information at the same time, resulting in a sharp drop in communication efficiency. Although the latter can avoid conflicts to a certain extent, However, due to the long propagation delay of the underwater acoustic channel, the handshake process becomes very long, while the transmission time of effective information is very short, resulting in low channel utilization.

In particular, the common underwater acoustic MAC protocol often only considers the communication between fixed nodes, and is not very applicable to communication networks with mobile nodes

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