A MAC protocol communication method based on cognitive acoustic technology

Abstract

The invention discloses a MAC protocol based on cognitive acoustic technology. On the basis of avoiding channel conflicts, the protocol designs a multi-session multi-channel link scheduling algorithm to realize time-space multiplexing at both ends of receiving and sending; then, using underwater acoustic recognition The known technology realizes the cross-layer optimization of the physical layer and the MAC layer by adjusting the operating parameters of the underwater nodes in the physical layer, combined with the link scheduling algorithm of the MAC layer and through the cross-layer optimization strategy.

Description

technical field [0001] The invention relates to a MAC protocol based on cognitive acoustic technology, belongs to the field of information technology, and is particularly suitable for the field of media medium access control of underwater wireless sensor networks. Background technique [0002] Although many MAC (Media Access Control) protocols for terrestrial wireless ad hoc networks and terrestrial wireless sensor networks have been invented, due to the huge difference between the underwater environment and the ground environment, the existing MAC protocols for terrestrial wireless communication networks And the link scheduling method cannot be directly applied to the underwater sensor network, it needs to redesign the MAC protocol with high efficiency and good stability. The main challenges faced in the design of underwater sensor network protocols and solutions are as follows: [0003] (1) Due to the relatively low speed of sound (1500m / s), the propagation delay in the u...

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Problems solved by technology

[0003] (1) Due to the relatively low speed of sound (1500m / s), the propagation delay in the underwater environment is five orders of magnitude higher than that of radio waves in terrestrial channels

[0004] (2) The underwater acoustic channel has serious attenuation characteristics, especially the signal attenuation caused by time-varying multipath and fading

[0005] (3) The bandwidth of the underwater acoustic channel is relatively low, only about 10k / bps;

But due to the relatively low speed of sound (1500m / s), the underwater propagation delay is five orders of magnitude higher than that of radio waves in terrestrial channels

Excessive propagation delay will cause serious degradation in the performance of RTS (Ready-to-Send) / CTS (Clear-to-Send) MAC protocols, and will cause time-space uncertainty, data transmission conflicts, and cause MAC protocols to fail

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