Underwater sensor network media access control method based on state

Abstract

The invention relates to the technical field of network communication, in particular to an underwater sensor network media access control method. The underwater sensor network media access control method based on a state comprises a layered distribution type spread spectrum code allocation algorithm based on discrete probability, a channel access control mechanism based on a state and sending power control. According to the method, channel access is controlled on the basis of state information of receiving nodes in a neighbor table, interference caused to node transmission data in a sending state in a half duplex system is avoided, and the problems of long time delay, high energy consumption and channel idling and the like which are caused by a traditional RTS / CTS (request to send / clear to send) handshaking mechanism in an underwater sensor network are solved; near-far effect of code division multiple access (CDMA) is reduced, and energy efficiency is improved. The underwater sensor network media access control method is suitable for sparse or dense topological underwater sensor network communication, and serving as an effective and practical technical scheme, the underwater sensor network media access control method has good application prospects in underwater data collection, environmental monitoring, disaster prevention and resource monitoring and the like.

Description

technical field [0001] The present invention relates to the technical field of network communication, in particular to a media access control method for an underwater sensor network Background technique [0002] Underwater sensor network (UWSN) has attracted great attention of researchers due to its broad application prospects in environmental monitoring, resource exploration, disaster prevention, etc. The underwater sensor network adopts underwater acoustic communication. The high bit error rate, long propagation delay, and low bandwidth of the underwater acoustic channel make traditional ground communication protocols unable to be directly applied to UWSN. Compared with traditional modems, UWSN acoustic modems are very energy-intensive; the nodes are powered by batteries, and it is difficult to charge and replace batteries in harsh underwater environments; due to the high price, the deployment of underwater nodes is relatively sparse, and most nodes will be lost at any tim...

AI Technical Summary

Problems solved by technology

Some literature points out that the optimal payload length of UWSN data packets is on the order of 100 bytes, while the length of RTS / CTS packets is dozens of bytes, which is not very small compared with UWSN data packets, so the RTS / CTS handshake mechanism is limited. The benefits are not obvious

On the contrary, due to the characteristics of low bandwidth, high delay, and high energy consumption of the underwater acoustic communication system, the RTS / CTS handshake mechanism greatly prolongs the end-to-end delay, reduces throughput, and increases energy consumption.

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