Channel access method for ship-mounted wireless mobile Ad-hoc network based on self-organization time division multiple access

A channel access method and mobile ad hoc network technology, which is applied in wireless communication, network topology, broadcast service distribution, etc., can solve the problems of lack of self-organized time division multiple addressing technology in shipborne communication systems, and improve dynamic network communication performance, improving dynamic responsiveness, and reducing the effect of network access time

Inactive Publication Date: 2012-07-04
ZHEJIANG OCEAN UNIV
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Problems solved by technology

[0005] At present, there are more than 500,000 large and small ships along the coast of my country, which are currently only limited to AIS-based broadcast communication, lacking the self-organizing time-division multiple addressing technology based on dual-channel (broadcast channel and unicast channel) of the shipborne communication system (SANET)

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  • Channel access method for ship-mounted wireless mobile Ad-hoc network based on self-organization time division multiple access
  • Channel access method for ship-mounted wireless mobile Ad-hoc network based on self-organization time division multiple access
  • Channel access method for ship-mounted wireless mobile Ad-hoc network based on self-organization time division multiple access

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the embodiments of the drawings.

[0033] In a shipborne ad hoc network environment, in order to respond to emergency signals with reliable access to the channel, the present invention proposes a unicast data channel synchronous time division multiple access protocol. This protocol is compatible with the original SOTDMA broadcast channel and can provide support for point-to-point data transmission. Ensure that ships can communicate in real time under emergency situations such as high speed, large steering angle, short distance, etc., and meet the safety requirements of ships for dynamic real-time access to channels. Such as figure 2 A schematic diagram of the unicast channel is given, in which each time slot is divided into three parts: the first part is the AIS protocol frame format (AISF); the second part is request to send / clear to send / acknowledgement (RTS / CTS / ACK) ; The third part is...

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Abstract

The invention relates to a channel access method for a ship-mounted wireless mobile Ad-hoc network based on self-organization time division multiple access, which is characterized in that a unicast channel is compatible with a broadcast channel, and channel is accessed in by means of the mode of a self-organization synchronous time division multiple access; two movement parameters of distance and speed are considered according to actual conditions of a ship, and an emergency signal is ensured to be preferentially accessed into the channel by means of risk factor levels; strategies of solving a constraint set of a minimum node and a three-level node withdraw scheme are adopted. Furthermore, if a broadcast signal is not obtained, a protocol degrades to an ordinary IEEE802.11 DCF to guarantee robustness of a system. Geographic information is fully utilized to solve the problem of exposure and concealing of a terminal and the scheme of selecting the constraint set of the minimum node (SMC) is solved. The channel access method is one of key technologies for constructing the ship-mounted mobile Ad-hoc network (MANET), and provides strong reference value for other mobile device organization networks.

Description

Technical field [0001] The invention relates to a wireless ad-hoc network (Mobile Ad-hoc Networks, MANET) media access control (MAC) related technology and application, in particular to a channel access method of dynamic synchronization time division multiple access, which belongs to the maritime ship through mobile self-organization The application scope of data transmission through networking. Background technique [0002] The current frequent occurrence of marine ship traffic accidents poses a huge threat to the safety of navigation and the marine environment. People are increasingly aware of the importance of data exchange between ships in emergency situations. Recently, a shipborne automatic identification system (AIS) adopts a self-organizing time division multiple access SOTDMA (Self-Organization TDMA) mechanism to meet the ship's need for collision avoidance in emergency situations. However, AIS can only broadcast safety signals periodically and cannot forward point-to-p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/06H04W56/00H04W74/08H04W84/18H04L1/16
Inventor 江有福高洪敏
Owner ZHEJIANG OCEAN UNIV
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