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Node retreating method based on UW-CSMA/CA in underwater acoustic network communication

A technology of underwater acoustic network and communication method, which is applied in the direction of wireless communication, error prevention/detection using return channel, electrical components, etc., which can solve the problem of long time consumption and achieve the effect of improving throughput

Inactive Publication Date: 2015-02-11
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] The purpose of the present invention is to overcome the time-consuming defect of the binary exponential backoff method in the prior art, thereby providing a fast and efficient node backoff method

Method used

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  • Node retreating method based on UW-CSMA/CA in underwater acoustic network communication
  • Node retreating method based on UW-CSMA/CA in underwater acoustic network communication
  • Node retreating method based on UW-CSMA/CA in underwater acoustic network communication

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Embodiment Construction

[0036] The present invention will be further described now in conjunction with accompanying drawing.

[0037] refer to figure 2 , the node backoff method of the present invention comprises the following steps:

[0038] Step 1), when the source node sends data for the first time, set the backoff times n to 0, and set the backoff window size CW to CW min , and then perform the data sending operation, and then wait for the receipt of successful data sending. If the receipt of successful data sending is received, save the size of the backoff window at this time to the variable CW used to indicate the size of the backoff window when the data was successfully sent last time last , and then end the operation. If the receipt of successful data transmission is not received within the specified time, go to the next step.

[0039] Step 2), once the source node fails to send data, set the backoff times n to 1, and set the backoff window size CW to max{CW last / 2,CW min ×2}, then perf...

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Abstract

The invention relates to a node retreating method based on UW-CSMA / CA in underwater acoustic network communication. The method comprises the following steps that when a source node sends data for the first time, the retreating times n is set to be 0, the retreating window size CW is set to be the retreating window minimum value CW<min>, then, data sending operation is carried out, if the data sending succeed receipt is received, the retreating window size at the moment is stored into a retreating window size variable CW<last> in the last time when the data is successfully sent, if the data sending succeed receipt is not received in the specific time, the retreating times n is set to be 1, the retreating window size CW is set to be max{CW<last> / 2, CW<min>*2}, then, the first data resending operation is carried out, then, the data sending succeed receipt is waited, if the data sending succeed receipt is not received in the specified time, the source node adds 1 onto the retreating times, the retreating window size CW is set to be max{CW*2, CW<max>}, and then, the data is resent.

Description

technical field [0001] The invention relates to the field of underwater acoustic communication, in particular to a UW-CSMA / CA-based node back-off method in underwater acoustic network communication. Background technique [0002] The ocean occupies more than two-thirds of the earth's area, and the observation and development of the ocean have attracted more and more attention from all countries. At the same time, the underwater acoustic network has become a research hotspot worldwide. The data link layer protocol is an important part of the study of underwater acoustic network. Compared with the wireless channel, the bandwidth of the underwater acoustic channel is limited and the propagation delay is large, which poses a great challenge to the design of the MAC protocol of the underwater acoustic network. [0003] According to the channel acquisition method of the protocol, the MAC protocol is divided into a scheduling-based MAC protocol and a contention-based MAC protocol. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08H04L1/18
Inventor 刘磊李宇张春华黄海宁
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI