Reliable data transmission method for network cross layer of underwater wireless sensor

Abstract

The invention discloses a reliable data transmission method for a network cross layer of an underwater wireless sensor. In the method, underwater sensor nodes are arranged in a three-dimensional underwater space, and an aggregation node is arranged on the water surface; the nodes are classified into different clusters according to depths; the nodes close to the perpendicular line of the aggregation node are selected as gateway nodes, and common nodes acquire data packets and transmit the data packets to the gateway nodes in the clusters of the common nodes within an appointed time slot; the gateway nodes fuse the data packets in the clusters and then perform inter-cluster data transmission along a perpendicular direction; the aggregation node schedules node communication time slots in a unified manner; adjacent inter-cluster nodes perform dislocated communication within the same time slot so as to avoid mutual interference of signals; and the nodes in the clusters communicate with oneanother by using a network encoding-based CSMA (Carrier Sense Multiple Access) improved mechanism to reduce transmission collision and reduce the number of times of retransmission. Through the designof transmission between adjacent clusters at different time slots, the method disclosed by the invention realizes a network cross layer design and avoids the data transmission collision to an extremely large extent, so that the data transmission reliability is improved, and the communication time delay is shortened.

Description

technical field [0001] The invention relates to an underwater wireless sensor network cross-layer reliable data transmission method, which belongs to the technical field of wireless sensor networks. Background technique [0002] Due to the severe attenuation of electromagnetic waves and optical signals in water, acoustic signals are widely used in underwater communication in the existing technology. Compared with the widely used electromagnetic wave and wired transmission technologies, acoustic signals face huge challenges: [0003] (1) Low bandwidth; [0004] (2) High delay; [0005] (3) The transmission energy consumption is high, and the nodes are difficult to charge; [0006] (4) Node cost is high. [0007] At the same time, underwater acoustic signals are still vulnerable to interference underwater. The above characteristics bring challenges to the reliability of data transmission in underwater wireless sensor networks. In response to this problem, some sensor netwo...

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Problems solved by technology

[0003] (1) Low bandwidth;

[0004] (2) High delay;

[0005] (3) The transmission energy consumption is high, and the nodes are difficult to charge;

[0006] (4) Node cost is high

However, the access conflicts, user interference, and signal fading of underwater acoustic channels are far more serious than those of wired networks. In this case, there are two problems in the layered protocol system: "non-optimal" and "inflexible".

"Non-optimum" is due to the lack of information sharing of the system as a whole between layers due to the layered design, and the information is insufficient for each layer, which cannot guarantee the optimal state of the entire network; Because the layered network is required to work normally in the worst case, the network protocol can only be designed based on the worst case, lacking the ability to adapt to changes in the environment, which affects the optimal allocation of existing resources by the protocol stack

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