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Method for sending information between underwater acoustic sensor network nodes

An underwater acoustic sensor and network node technology, applied in network topology, wireless communication, transmission system, etc., can solve problems such as increased conflicts, wasted bandwidth, long waiting time, etc., to reduce conflicts, increase differences, and avoid conflicts Effect

Inactive Publication Date: 2013-12-18
HARBIN ENG UNIV
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  • Description
  • Claims
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Problems solved by technology

Below the optimal value, the waiting time of each node is too short, and the conflict will increase. If it is greater than the optimal value, each node will wait too long before sending a packet, wasting bandwidth

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  • Method for sending information between underwater acoustic sensor network nodes

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Embodiment Construction

[0014] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0015] The invention proposes an information sending mechanism between nodes of an underwater acoustic sensor network. Its implementation method is: each node waits for a random time before sending a data packet. The existing solution is to randomly select a time in the interval (0, MAX_CW), called CW, where MAX_CW is the longest time that can be waited. The design of the present invention is: (0, MAX_CW) is divided into n parts, namely (0, MAX_CW / n), (0, 2*MAX_CW / n), (0, 3*MAX_CW / n),..., (0, (n-1)*MAX_CW / n), (0, MAX_CW), where n is a preset parameter, generally 10. Before sending a data packet, each node selects one of the above n intervals in turn, and then randomly selects a value CW from this interval as the random waiting time. When (0, MAX_CW) is selected, the next selection interval is (0, MAX_CW / n), and so on. As shown in the attached figure, the curre...

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Abstract

The invention provides a method for sending information between underwater acoustic sensor network nodes. The method is characterized in that: before sending a data packet, every node waits a random time; (0, MAX_CW) is divided into n parts, which are (0, MAX_CW / n), (0, 2*MAX_ CW / n), (0, 3* MAX_CW / n)..., (0, (n-1)* MAX_ CW / n), (0, MAX_CW), wherein n is a preset parameter; before sending the data packet, the each node successively selects one of the n intervals and then randomly selects one CW from the interval as the random waiting time; when the node selects the (0, MAX_CW), the next selected interval is (0, MAX_CW / n) and so on. By using the method, differences of CW selections can be increased and conflicts can be avoided. When the selected MAX_CW is large, a mean value of the CW values selected by each node can be maintained lower than an original scheme and a system throughput rate can be maintained higher. If a packet loss ratio of the every node is high because of the conflicts, a selected ranged should be raised, conflicts should be reduced and the throughput rate should be raised.

Description

technical field [0001] The invention relates to an underwater communication method. Specifically, it is a method for underwater sensor networks to communicate wirelessly through sound. Background technique [0002] Due to the large delay, narrow bandwidth and high error rate of underwater acoustic communication, ordinary land wireless communication protocols cannot be directly applied to this field. Large delays cause packets to easily collide. The current way to avoid this is for each node to wait a random amount of time before sending a packet, called CW. Let MAX_CW be the maximum time of random waiting, then randomly select CW in (0, MAX_CW). [0003] The current research shows that MAX_CW in the underwater sensor network has an optimal value, below or above this optimal value, the system performance will decrease. If it is lower than the optimal value, the waiting time of each node is too short, and the conflicts will increase; if it is greater than the optimal value...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B13/02H04W84/18
Inventor 姚念民马海峰
Owner HARBIN ENG UNIV