A Conflict-Free Parallel Communication Method for Underwater Acoustic Networks with Competitive Channels

Abstract

The invention discloses a conflict-free competition-channel parallel communication method of an underwater acoustic network, and the method is used for competition protocol based underwater acoustic communication network, underwater acoustic sensing network of full communication structure and the like. In a handshake stage, RTS / CTS signaling are transmitted in parallel via a concurrent time division multiplexing mechanism, conflict between RTS / CTS signaling can be eliminated completely, data transmission conflict caused by that a node cannot master all nodes of successful handshake in the sametransmission period and makes errors in calculating data transmission time in a present method is avoided, the handshake time can be reduced, and the transmission efficiency is improved; and in a last data transmission state, ACK / NACK signaling is sent in an RTS or CTS time slot in the next handshake state instead of time arranged independently, and the utilization efficiency of channels is higher. According to the method of the invention, two dormancy mechanisms are provided, energy consumption of the nodes can be reduced effectively, and the method has significance in the condition that energy of the underwater nodes is limited and not easy to supplement.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic communication, in particular to a parallel communication method for a competition-channel underwater acoustic network without conflict. Background technique [0002] The static underwater acoustic communication network is usually composed of sensor nodes and sea surface buoy nodes deployed on the seabed or in the sea. They form a distributed, multi-node, and large-coverage underwater three-dimensional network through two-way acoustic links. The information is collected, processed, classified, compressed, etc., and the information can be relayed back to the land-based or ship-based information center through the underwater node. [0003] Medium Access Control (MAC) is the key technology of the underwater acoustic communication network, which determines the way nodes share the underwater acoustic channel resources, and its performance directly affects the utilization of the underwater ac...

AI Technical Summary

Problems solved by technology

However, in the existing handshake-based underwater acoustic network MAC protocol, limited by the underwater bandwidth, usually only one pair of nodes can communicate with each other in each transmission cycle. There are the following shortcomings in the environment: (1) The idle time waiting for the arrival of information accounts for a large proportion in the transmission process and cannot be used

Underwater, it takes a long time for the information sent by the source node to reach the destination node. In the case that only one pair of nodes can communicate in each transmission cycle, the idle time waiting for the information to arrive cannot be used. The proportion of it in the transmission process is The larger the value, the more waste of spectrum resources

(2) The communication of multiple pairs of nodes requires multiple transmission cycles, and multiple handshakes make the transmission efficiency not high

[0005] The above methods can effectively improve the performance of the existing handshake-based underwater competition MAC protocol, but because these methods require the source node to accurately know the information of all nodes that have successfully handshaked in the same transmission cycle, and plan the time to send data accordingly, Therefore, there are still the following deficiencies in practical applications: (1) the collision of RTS / CTS in the handshake phase will cause transmission errors

In the above method, since the sending of RTS / CTS in the handshake phase is random, there is inevitably the possibility of conflict, so that the nodes that need to communicate cannot accurately know all the node pairs that have successfully handshake in the same transmission cycle, so the wrong calculation The time to send data; (2) The transmission efficiency of ACK / NACK signaling is low

In the above method, after the data transmission of all nodes is completed, it is necessary to separately arrange a period of time for the destination node to send ACK / NACK signaling. This extra overhead time occupies a certain proportion in the entire transmission cycle, which reduces the channel utilization.

(3) Does not include dormancy mechanism

None of the above methods include a sleep mechanism, which has obvious limitations when the energy of underwater nodes is limited and charging is not easy

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