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TDMA (Time Division Multiple Address) method used in underwater sound communication network

A communication network and underwater acoustic technology, applied in wireless communication, communication between multiple stations, electrical components, etc., can solve the problems of low channel utilization and high proportion of idle time, and achieve the effect of improving transmission efficiency

Active Publication Date: 2011-06-15
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional TDMA requires a large time slot length in order to avoid data frame collisions. Each time slot is composed of data frames and idle time for collision avoidance. The long propagation delay characteristics of underwater acoustic channels make the idle time in time slots ratio is high, resulting in lower channel utilization

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  • TDMA (Time Division Multiple Address) method used in underwater sound communication network
  • TDMA (Time Division Multiple Address) method used in underwater sound communication network
  • TDMA (Time Division Multiple Address) method used in underwater sound communication network

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0032] The design of the network protocol is closely related to the topology structure. This invention mainly considers a typical application environment of the underwater acoustic communication network, that is, the network adopts a centralized topology structure with a single-hop connection between the main node and the sub-nodes, and the sub-nodes collect information from the main node. application occasions.

[0033] Since the underwater nodes do not have the support of GPS synchronization equipment, it is difficult to ensure the absolute time synchronization of the entire network. The TDMA method of the underwater acoustic network often adopts the method of transmitting synchronization frames and setting transmission delays to maintain TDMA timing synchronization. figure 1 It is a schematic diagram of time slot allocation in general TDMA mode. Nodes send...

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Abstract

The invention discloses a TDMA (Time Division Multiple Address) method used in an underwater sound communication network. In a networking preparing stage, a network main node measures a propagation delay of the network main node and each child node and calculates to obtain an emitting delay value and a receiving time slot order of each child node; in a data transmitting stage, the main node periodically broadcasts a synchronization frame carrying the delay value, each child node emits a data frame according to the delay value, thus a plurality of child nodes can emit the data frame at the same time in the network and the data frame is received at the main node in a collisionless manner, and the flexible control on the exit of the original node and the addition of the new node is realized through adding sign information in the data frame and reserving handshaking time slots in a time slot period. The invention has the advantage that the quantity of the TDMA time slots and the transmitting delay value of the child nodes are regulated in real time according to the quantity of movable nodes, thus the channel utilization rate is remarkably increased.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication network access, and mainly relates to a TDMA method for the underwater acoustic communication network. Background technique [0002] The underwater acoustic network is to obtain underwater information through various sensor nodes in a certain underwater area, and carry out underwater acoustic communication and networking for underwater nodes, and finally through specific nodes, reconnect the information in the form of radio and cable. Information acquired in the coverage area is incorporated into the regular network onshore and sent to the observer's sub-network. With the rapid growth of people's demand for marine data collection, marine resource exploitation, disaster prevention, auxiliary navigation, regional underwater warning, etc., underwater acoustic communication network technology has attracted the attention of academic and military circles. [0003] There are many differe...

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Application Information

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IPC IPC(8): H04B7/26H04W74/08
Inventor 张宏滔凌国民
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP