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Link switching method based on predictive information in indoor optical communication system

A communication system and indoor light technology, which is applied in the direction of services based on specific environments, wireless communication, short-distance systems, etc., can solve problems affecting communication quality, limited coverage of LED lighting, and difficulty in ensuring communication continuity, etc., to achieve lightening Complexity, effect of guaranteeing communication quality

Active Publication Date: 2021-08-10
NANJING UNIV OF POSTS & TELECOMM
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the continuous research and exploration of visible light communication, a practical difficulty is faced: the light emitted by the LED light source is directional, which results in a limited coverage of LED light. When moving around, it is difficult to ensure the continuity of communication, which affects the quality of communication

Method used

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  • Link switching method based on predictive information in indoor optical communication system
  • Link switching method based on predictive information in indoor optical communication system
  • Link switching method based on predictive information in indoor optical communication system

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Embodiment Construction

[0024] like figure 1 As shown, the transmitting end of the present invention uses an LED array as a signal source, which is mainly composed of preprocessing, modulation and LED sending modules, and uses the high-speed flashing of LEDs (switching characteristics of diodes) to send information, and each LED array is used as a network access Point AP (Access Point, AP), the system contains at least 3 LED arrays, which serve as different network access points AP, and provide lighting for users at the same time. The receiving end of the present invention can use mobile user terminals, such as mobile phones, tablet computers, notebook computers, etc., each terminal uses a photodetector as an "antenna" to detect signals, and the photodetector utilizes the photoelectric conversion effect to As many photons as possible are converted into electrons, and the electrons are sensed by the external circuit as much as possible. When the mobile terminal moves under different APs, it constantly...

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Abstract

The invention discloses a link switching method based on pre-judgment information in an indoor optical communication system. The system includes more than three network access point LED arrays and at least one gateway. The first step is to set a mobile terminal according to the pre-judgment information. In the second step, the gateway detects the pre-handover condition with T1 as a cycle. If the pre-handover condition is not met, continue to perform this step. If the pre-handover condition is met, start the pre-handover command and execute the following Step 3; Step 3 The gateway detects the handover condition with T2 as a period. If the handover condition is not satisfied, it continues to perform this step. If the handover condition is satisfied, it starts the handover command to complete the handover process, T2≤T1. The invention can ensure the continuity of communication when the user terminal switches between different network access points AP, improve the communication quality, and at the same time, it will not bring more burden to the terminal mobile equipment, reduce the complexity of the system, and has practical effects sex, portability.

Description

technical field [0001] The invention relates to a link switching method applied in an indoor optical communication system, in particular to a link switching method based on pre-judgment information applied in an indoor optical communication system. Background technique [0002] White light LED has the advantages of low efficacy, long service life, small size, easy to drive, green and environmental protection, and is regarded as the fourth generation of energy-saving and environment-friendly lighting products. White LEDs have very high response sensitivity and good modulation characteristics, and can be used for high-speed wireless communication with white LEDs. Therefore, white LEDs can be used as an access point for wireless communication while providing illumination. Combining indoor communication base stations with white LED lighting equipment and connecting them to other communication networks is Visible Light Communication (VLC). [0003] At present, visible light com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04W4/33H04W36/00
CPCH04B10/116H04W36/0094H04W4/33
Inventor 王炯乾洪文昕许嘉琪宋官泽
Owner NANJING UNIV OF POSTS & TELECOMM
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