A media medium access control method for underwater wireless sensor network
A medium access control, wireless sensor technology, applied in wireless communication, network topology, electrical components, etc., can solve the problems of increasing message transmission time, underwater acoustic channel attenuation, large propagation delay, etc., to reduce data transmission delay and overhead. Effect
Active Publication Date: 2017-12-08
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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[0004] (2) The underwater acoustic channel has serious attenuation characteristics, especially the signal attenuation caused by time-varying multipath and fading
It can be seen that the application of MACA in the underwater sensor network will seriously damage the system performance due to the large propagation delay.
[0010] (2) For underwater sensor networks with heavy loads, RTS / CTS protocols will cause frequent backoffs, increase message transmission time, and reduce system performance
[0011] (3) The underwater sensor network MAC protocol needs to be fair, which requires each node to be in the same position, but for the RTS / CTS protocol, its inherent exposed terminal and hidden terminal problems make some nodes always at a disadvantage
[0012] On the other hand, although there are still some distributed random MAC protocols based on channel contention, they have not studied the relationship between the transmission success rate and the number of retransmissions, resulting in either too high transmission delay or too low transmission success rate
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[0032] The invention proposes a distributed random (Distributed Random) MAC protocol suitable for underwater sensor network—DRMAC, which overcomes the problem of high propagation delay in underwater sensor network, and fully reduces the transmission delay between nodes. At the same time, the data transmission conflict caused by the uncertainty of space and time can be effectively alleviated. The operation of this protocol only needs the information of the neighbor nodes in the network. It has the characteristics of distributed distribution and can be well applied to the environment where the network topology changes dynamically.
[0033] According to an embodiment of the present invention, a method for media access control of an underwater sensor network based on a single-hop network is provided. The so-called single-hop network means that any two nodes in the underwater sensor network are neighbor nodes to each other. In this way, the number of neighbor nodes of any node is ...
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The invention provides an underwater wireless sensor network media medium access control method. The underwater wireless sensor network is a synchronizing network. The method comprises the steps of 1) acquiring the maximum degree n in a topological structure of the underwater wireless sensor network, and receiving a data packet receiving and sending success rate theta to be reached; 2) attempting to send a data packet to be sent by each node in the underwater wireless sensor network at m continuous time slots based on the probability X=1 / (n+1). The formula is shown in the specification. With the adoption of the method, the dynamic variation environment of the network topology can be adapted well; the underwater wireless sensor network has a certain success sending probability, and the data transmission delay and cost are minimized.
Description
technical field [0001] The present invention relates to the technical field of wireless sensor networks, and in particular, the present invention relates to a medium access control (MAC) method for underwater wireless sensor networks. Background technique [0002] Due to the huge difference between the underwater environment and the ground environment, the MAC protocol and link scheduling method of the existing ground wireless communication network cannot be directly applied to the underwater sensor network, and the MAC protocol with high efficiency and good stability needs to be redesigned. . The challenges faced by the underwater sensor network protocol and scheme design are as follows: [0003] (1) Due to the relatively low speed of sound (1500 m / s), the propagation delay in the underwater environment is five orders of magnitude higher than that of radio waves in terrestrial channels (refer to R.J. Urick, "Principles of Underwater Sound 3rd Edition," McGraw-Hill, 1983 ....
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IPC IPC(8): H04W56/00H04W84/18
CPCH04W56/001H04W84/18
Inventor 李超李晓维徐勇军安竹林
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI