Uplink competitive access method of heterogeneous network based on optical communication VLC

A heterogeneous network and competitive access technology, applied in the field of optical communication, can solve the problems of slow growth of contention window, high back-off order, and large network delay, so as to expand the range of virtual carrier sensing, increase the growth rate, The effect of reducing network delay

Active Publication Date: 2018-11-30
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The growth rate of the existing contention window is slow. When the number of mobile terminals is large, the probability of collision is high, and the backoff order is high, and the network delay is large.

Method used

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  • Uplink competitive access method of heterogeneous network based on optical communication VLC
  • Uplink competitive access method of heterogeneous network based on optical communication VLC
  • Uplink competitive access method of heterogeneous network based on optical communication VLC

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Experimental program
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Effect test

Embodiment 1

[0027] Visible light communication (VLC) combines lighting and communication, adds data transmission function to lighting facilities, and transmits information through high-speed flickering of light sources. VLC uses the visible light frequency band that is higher than 3THz and belongs to the blank spectrum, and is not restricted by the license. At the same time, because it cannot penetrate walls and other obstructions, the visible light signals in adjacent closed units will not interfere with each other, and the security is good. In practical applications, the existing VLC technology has problems such as mutual interference between uplink and downlink, difficult realization of uplink, large uplink access delay, and low data transmission rate. At the same time, traditional VLC uses beacons for radio frequency communication. Frames cannot meet the requirements of visible light heterogeneous networks.

[0028] The present invention has launched research on this, proposes a kind ...

Embodiment 2

[0052] In the existing optical communication technology, there is no beacon frame applied to the heterogeneous network of VLC and infrared communication. The present invention designs a beacon frame applicable to the heterogeneous network of visible light communication.

[0053] The uplink competitive access method of a heterogeneous network based on optical communication VLC is the same as that in Embodiment 1. The present invention is applied to a beacon frame of a visible light heterogeneous network, with a total of 22 bytes, including a 1-byte start flag, a 2-byte check field, and a 1-byte end flag. see figure 1 After the start flag bit, there are: 1byte frame control bit, 2byte beacon interval, 6byte destination address, 6byte source address, 1byte infrared receiver identification code and 2byte frame body, the 2byte frame body is connected with the check digit, and used For the heterogeneous network of VLC and infrared communication, refer to figure 2 , the details are...

Embodiment 3

[0072] The uplink contention access method of a heterogeneous network based on optical communication VLC is the same as that in Embodiment 1-2, and the IR_Busy field in the frame body of the beacon frame is used to indicate whether the infrared receiver bound to the visible light AP is busy, that is, whether the infrared channel is occupied , broadcast periodically through the visible light channel. The mobile terminal receives visible light signals in real time, analyzes relevant information, and reads the busy and idle information of the infrared channel, thereby virtually listening to the status of the infrared channel, expanding the listening range of the mobile terminal to the infrared channel, and improving the channel utilization rate.

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Abstract

The invention discloses an uplink competitive access method of a heterogeneous network based on optical communication VLC for mainly solving the problems that the uplink and downlink interference of the VLC technology is serious, the network delay is large, and that the data packet retransmission probability is relatively large. The scheme is as follows: constructing a visible light beacon frame to realize isomerism between VLC and infrared communication; adding busy and idle information of an infrared channel to the visible light beacon frame, and increasing a detectable range of the infraredchannel in a broadcasting manner; judging whether the channel is busy or idle, and executing an improved backoff algorithm; and sending an access request and data after a condition is met, and completing the uplink access of the heterogeneous network based on the optical communication VLC. The invention designs the visible light beacon frame containing infrared channel information, the separationof the uplink and the downlink in an optical communication network can be realized, the mutual interference is avoided, the existing infrared communication backoff algorithm is improved, a nonlinearbackoff function is proposed, the network delay and the data packet retransmission probability are reduced, and the communication is better implemented. The uplink competitive access method is suitable for indoor visible light heterogeneous network communication.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and relates to a MAC layer competitive access mechanism, in particular to an optical communication VLC-based uplink competitive access method of a heterogeneous network, which is suitable for indoor visible light heterogeneous communication networks. Background technique [0002] Optical Communication (Optical Communication) is a communication method using light waves as the carrier, mainly including optical fiber, indoor visible light, wireless light and other communication technologies. In recent years, with the rapid development of solid-state lighting technology, white light-emitting diodes (LEDs) have been widely used. As an emerging wireless communication technology, visible light communication (VLC) based on white LED has attracted the attention of many institutions and scholars. VLC refers to the communication method that uses light in the visible light band as an informati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/116H04B10/114H04W74/08
CPCH04B10/114H04B10/116H04W74/0816
Inventor 贾婷婷尚韬董赞扬孙志鹏李骞唐堂
Owner XIDIAN UNIV
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