MAC scheduling method of mesh underwater acoustic network

An underwater acoustic network and scheduling method technology, applied in network traffic/resource management, electrical components, wireless communication, etc., can solve problems such as slow propagation speed, prolonged propagation, and collision of underwater acoustic networks, so as to reduce the scheduling time, The effect of full channel utilization and reduced scheduling duration

Active Publication Date: 2020-01-14
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

The underwater acoustic network uses sound waves as the carrier, and the propagation speed of sound waves (1500m/s) is faster than the propagation speed of ground electromagnetic waves (3×10 8 m/s) is 5 orders of magnitude slower. Such channel characteristics make the underwater acoustic network and the wireless network have the following differences: the propagation delay of the wireless network can be ignored, and the only reason for the collision is to transmit data at the same time. Conflicts can be avoided; however, the propagation speed of underwater

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  • MAC scheduling method of mesh underwater acoustic network
  • MAC scheduling method of mesh underwater acoustic network
  • MAC scheduling method of mesh underwater acoustic network

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[0034] Such as figure 1 As shown, this example discloses a MAC scheduling method for a mesh underwater acoustic network, and the specific steps are as follows:

[0035] S1. Traverse all network nodes and set the minimum sending time difference A node whose sending time is zero is recorded as a scheduled node. Among them, t f is the transmission time of one frame, v is the propagation speed of sound wave in water, d j,i'is the distance between node j and the receiving node i' of node i, considering the case of N pairs of transmissions, that is, a pair of transmissions from node i to node i', when j takes i, it means a pair of transmissions from node i to its other The distance of the receiving node; this method of scheduling nodes makes the time for nodes to complete conflict-free transmission earlier, and finally achieves the result that the scheduling time required for all nodes to transmit is the shortest;

[0036] S2. Select the node with the minimum A node of the va...

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Abstract

The invention discloses an MAC (Media Access Control) scheduling method for a mesh underwater acoustic network, which comprises the following steps of: traversing all network nodes, calculating the minimum sending time difference of conflict-free transmission between each node and other nodes, sequentially arranging from small to large, and determining a scheduling sequence of each node; calculating the feasible sending time interval of each node, ensuring that the data packets sent by each sending end do not collide at the receiving end, and taking the minimum value of the feasible sending time interval as the sending time; and calculating the inter-frame conflict-free scheduling duration of each node, taking the maximum value of the scheduling duration of each node as the final scheduling duration, and enabling each node to perform sending by taking the final scheduling duration as a period. According to the invention, higher MAC scheduling capacity can be realized, and the maximum MAC scheduling capacity is approached to a greater extent.

Description

technical field [0001] The invention relates to the field of medium access control (MAC) of an underwater acoustic network, in particular to a MAC scheduling method of a mesh underwater acoustic network. Background technique [0002] The ocean area of ​​the earth accounts for 71% of the total area of ​​the earth. The study of the underwater acoustic network for ocean research and seabed detection has attracted the attention of countries all over the world. Hydroacoustic networks are currently applicable to many research fields, such as: offshore oil exploitation, pollution monitoring, tsunami warning, auxiliary navigation, ecological monitoring, etc. Media Access Control (MAC) is one of the key factors affecting the performance of underwater acoustic networks. Its main purpose is to coordinate the fair and efficient sharing of media resources among multiple nodes and avoid transmission collisions. [0003] Media access control for hydroacoustic networks differs from that fo...

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Application Information

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IPC IPC(8): H04W28/02H04W72/12H04W74/08H04B13/02
CPCH04B13/02H04W28/0294H04W72/1263H04W74/0816
Inventor 季飞郑淇尹官权升陈伟琦
Owner SOUTH CHINA UNIV OF TECH
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