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VDES system adaptive channel selection method capable of reducing time slot conflict probability

A technology of adaptive channel and collision probability, applied in wireless communication, electrical components, etc., can solve the problems of time slot conflict, AIS subsystem can not work normally, affect message transmission, etc., to ensure compatibility and reduce time slot collision probability , the effect of high practicability

Pending Publication Date: 2021-07-13
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the number of ships and the types of messages continue to increase, when ships use the SOTDMA protocol to reserve time slots, there may be timeslot conflicts caused by multiple ships reserving the same time slot, which affects the sending of normal messages, and the AIS subsystem cannot function normally. work, and the AIS system is responsible for the sending and receiving of ship position and navigation safety messages, so it will have serious consequences

Method used

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  • VDES system adaptive channel selection method capable of reducing time slot conflict probability
  • VDES system adaptive channel selection method capable of reducing time slot conflict probability
  • VDES system adaptive channel selection method capable of reducing time slot conflict probability

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Embodiment Construction

[0031] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0032] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] Such as figure 1 Shown, a kind of VDES system self-adaptive channel selection method that can reduce the time slot collision probability comprises the following steps:

[0034] S1. Classify the message messages in the AIS system, and set flag bits for the classified messages;

[0035] S2. S...

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Abstract

The invention discloses a VDES system adaptive channel selection method capable of reducing time slot conflict probability, comprising the following steps: classifying messages in an AIS system, and setting flag bits for the classified messages; setting a time slot conflict probability threshold, and selecting a transmission channel corresponding to each type of message according to the time slot conflict probability threshold and the flag bit; and accessing a network and reserving a time slot, and when the time slot arrives, sending the message through the selected transmission channel to complete adaptive channel selection. According to the method, the messages related to safety in the original AIS system can be set to the highest priority, and meanwhile, the time slot conflict probability can be effectively reduced in a dense water area.

Description

technical field [0001] The invention belongs to the field of maritime communication, and in particular relates to a VDES system adaptive channel selection method which can reduce the probability of time slot conflict. Background technique [0002] The VDES system is developed on the basis of the traditional AIS system and includes three subsystems: AIS, ASM and VDE. Compared with the traditional AIS system, the VDES system can provide global maritime communication equipment with greater capacity and faster data exchange capabilities. Therefore, the VDES system has played an important role in ensuring the safety of ships at sea and promoting the development of modern shipping traffic. [0003] When the number of ships in the communication sea area is small, the AIS subsystem in the VDES system can work normally. However, as the number of ships and the types of messages continue to increase, when ships use the SOTDMA protocol to reserve time slots, there may be timeslot conf...

Claims

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Application Information

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IPC IPC(8): H04W72/04H04W74/08
CPCH04W72/0446H04W74/0808
Inventor 朱继飞李桓王坚杨鍊刘阳张天驰
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA