Underwater acoustic network communication method for joint optimization of node sending time and power

Abstract

The invention discloses an underwater acoustic network communication method for joint optimization of node sending time and power. The method comprises the following steps: when a channel is idle and at least one node needs to transmit the data, the network enters a handshake phase; each source node adopts the same non-random algorithm to calculate the connection relation of each node of the network when all the source nodes transmit the data at the minimum transmitting power that is required for successfully transmitting the data to the corresponding destination node, divides the whole network to sub-networks which are not communicated with each other, calculates the time that the node can transmit the data to the corresponding destination node without conflicts in the local sub-network, and transmits the data to the corresponding destination node at the minimum transmitting power after timing to the moment; and when all the source nodes complete the data transmission, the network enters an end phase. According to the underwater acoustic network communication method disclosed by the invention, the fully-communicated network is converted to multiple sub-networks which are not communicated with each other during the data transmission phase, the time required for a transmission cycle can be effectively reduced, the utilization efficiency of the channel can be increased, and the energy consumption can be reduced.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to an underwater acoustic network communication method for joint optimization of node transmission time and power. Background technique [0002] Underwater acoustic communication network has a wide range of uses in underwater exploration, underwater oil exploitation, tactical monitoring, pollution monitoring, tsunami warning, auxiliary navigation, ecological monitoring, etc. The demand for high-performance underwater acoustic communication networks will increase. However, the characteristics of underwater acoustic channels such as narrow frequency band, long delay, and limited energy greatly restrict the communication performance of underwater acoustic networks. Most of the network communication protocols that perform well on land cannot be directly applied underwater. Modify or redesign the existing protocol according to the characteristics of the environment. Amo...

AI Technical Summary

Problems solved by technology

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

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 there are still the following deficiencies: (1) These methods treat the network as a fully connected network during the entire transmission cycle, and fail to take advantage of some nodes Due to the small mutual influence of sending signals, the timing of node sending is not compact enough, and the parallelism of node communication cannot be fully explored.

(2) In order to maintain the full connectivity of the network, these methods always use high fixed power for transmission throughout the transmission cycle, and cannot adjust the transmission power of nodes according to the distance between communication nodes, which consumes a lot of energy

Images