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Media access control method based on spatial fairness in underwater sensor network

A medium access control, underwater sensor technology, applied in network topology, network traffic/resource management, transmission system, etc., can solve problems such as uncaptured channels

Inactive Publication Date: 2014-07-16
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the underwater acoustic medium, nodes that are close to the receiving node are often easier to access the channel, while those that are far away from the receiving node may not be able to capture the channel.

Method used

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  • Media access control method based on spatial fairness in underwater sensor network
  • Media access control method based on spatial fairness in underwater sensor network
  • Media access control method based on spatial fairness in underwater sensor network

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Embodiment Construction

[0023] The medium access control method suitable for underwater sensor networks proposed by the present invention has a time tag in the request message UW-REQ sent by each node, and records the time when the message is sent and the time when the message is received by the receiving node , and each node sets a competition counter to count the number of times the node participates in the competition. Once the competition is successful, the data transmission can be performed, the counter is cleared, and the UW-REQ contains the real-time competition times information of the node. The competition weight is set in UW-REQ. After receiving the UW-REQ, the receiving node enters the Silence Duration (SD) stage to listen, and listens to all UW-REQ messages sent by surrounding neighbor nodes during this period. Send a Delay UW-REP packet after receiving the first UW-REQ packet to avoid the hidden node problem. The receiving node queries the number of competitions contained in the UW-REQ ...

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Abstract

The invention belongs to the technical field of underwater sensor network communication and provides a media access control method based on spatial fairness in an underwater sensor network. The media access control method comprises the following steps of: setting a time label in a request message sent by each node; setting a competition counter for each node, calculating the times of the node which participates in competition, carrying out data transmission once the node participates in competition successfully, and zeroing the counter; after a receiving node receives the request message, sending a response message after delaying for a certain time called as an SD stage; and searching competition times information contained in the request message received in the SD stage by the receiving node, setting the weight value of a transmitting node to be higher and adding the transmitting node into a high-right-value queue once the competition times of certain nodes exceeds a competition threshold, or setting the weight value of the transmitting node to be lower and adding the transmitting node into a low-right-value queue. According to the media access control method disclosed by the invention, the transmission fairness can be achieved under the multi-competition condition.

Description

technical field [0001] The invention relates to the technical field of underwater sensor network communication, in particular to a method for medium access control layer nodes to perform fair transmission. Background technique [0002] Wireless communications on land usually use electromagnetic waves and light waves as carriers for transmission, but in underwater environments, due to attenuation and other reasons, it is not suitable to use the above two as carriers. In contrast, sound waves have the best propagation characteristics in underwater environments, and are the only means of information transmission that can be transmitted over long distances in water media. Therefore, the underwater wireless sensor network is a wireless communication network with sound waves as the carrier. [0003] The physical factors affecting underwater acoustic communication mainly include: long and variable propagation delay, large path loss, serious multipath transmission, and Doppler freq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06H04W28/16H04W84/18
Inventor 金志刚窦飞苏毅珊
Owner TIANJIN UNIV
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