Indoor VLC-WiFi hybrid communication system access selection method

A technology of access selection and hybrid communication, which is applied in the field of optical communication and can solve problems such as easy blocking of optical links and difficulties in realizing uplinks

Active Publication Date: 2019-03-15
CHONGQING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, a single VLC network has defects such as easy to be blocked optical links and difficult implementation of uplinks, which makes VLC networks urgently need to use other wireless access technologies as effective supplements.

Method used

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  • Indoor VLC-WiFi hybrid communication system access selection method
  • Indoor VLC-WiFi hybrid communication system access selection method
  • Indoor VLC-WiFi hybrid communication system access selection method

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Embodiment Construction

[0042] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] Such as image 3 As shown, there is one LED array on the ceiling of the hybrid communication system, and each LED array is regarded as a VLCAP containing multiple low-power LEDs, covering a certain range and forming an optical cell. A WiFi AP is placed inside the room to make the WiFi network cover the whole room. Since it is difficult to realize the visible light uplink, the uplink signal transmission of the present invention is carried by the WiFi network. All VLC APs and WiFi APs are connected to the same central controller. After the user sends a resource request to the central controller through the WiFi link, the central controller transmits resource allocation information to the user through the power line to the VLC or WiFi downlink. Figure 4 The VLC APs in the middle are in a square layout, the length of the square room i...

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Abstract

The invention relates to an indoor VLC-WiFi hybrid communication system access selection method, and belongs to the technical field of the optical communication. The method comprises the following steps: improving correlation of receiving-transmitting end based on gravitation theory, and optimizing an access selection decision of the user based on the gravitation theory in a hybrid system composedof the cascaded VLC and WiFi; taking WiFi as supplementary technology of the VLC, designing an optimal access principle for the user under the extreme VLC channel status that all available VLC APs are shielded and located in a line-of-sight link dead zone; and designing a dynamic load assessment formula and an access point quality assessment formula based on self-adaptive QoS weight for residualusers at a transmitting end; designing the user quality assessment weight formula at a receiving end; improving the gravitation theory through the assessment weight so as to determine the bidirectional communication selection of the access point and the user. The throughput capacity of the VLC-WiFi hybrid communication system can be effectively improved, and the indoor VLC-WiFi communication access selection decision is optimized.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and relates to an access selection method of an indoor VLC-WiFi hybrid communication system. Background technique [0002] Visible Light Communication (VLC) has received increasing attention and research in recent years due to its advantages such as low power consumption, high security, and no need for spectrum certification. VLC uses light emitting diodes (Light Emitting Diode, LED) to achieve signal transmission. In order to ensure indoor lighting requirements, VLC networks often adopt access point (Access Point, AP) layout schemes with overlapping illumination ranges, so that users can receive Field of View (Field of View) View, FOV) can receive optical signals from multiple VLC APs. A reasonable AP access point selection scheme can reduce the impact of inter-cell interference on users, balance the load between APs, and make full use of network resources. In addition, a single V...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04B17/382H04W48/16
CPCH04B10/116H04W48/16H04B17/382
Inventor 刘焕淋吴兰陈勇朱平鑫蒲欣
Owner CHONGQING UNIV OF POSTS & TELECOMM
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