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Visible light full-duplex continuous transmission random access method based on channel reservation mechanism

A channel reservation and random access technology, applied in the field of visible light communication, can solve problems such as hidden nodes and performance cannot be eliminated

Active Publication Date: 2020-07-03
SUN YAT SEN UNIV
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  • Description
  • Claims
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Problems solved by technology

[0006] Aiming at the immature development of the current IEEE 802.15.7 standard, the visible light CSMA / CA protocol cannot eliminate hidden nodes and poor performance, based on the RTS / CTS channel reservation mechanism, a random access of full-duplex continuous transmission is proposed method, which can effectively solve the visible light hidden node problem and simultaneously optimize the throughput and delay performance of the visible light CSMA / CA protocol

Method used

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  • Visible light full-duplex continuous transmission random access method based on channel reservation mechanism
  • Visible light full-duplex continuous transmission random access method based on channel reservation mechanism
  • Visible light full-duplex continuous transmission random access method based on channel reservation mechanism

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Embodiment 1

[0043] Such as Figure 1~3 As shown, a visible light full-duplex continuous transmission random access method based on the channel reservation mechanism includes the following specific steps:

[0044] S1: The user has data waiting to be sent, and performs random backoff;

[0045] S2: The backoff time is over, and the user executes CCA to determine whether the current channel is idle;

[0046] S3: If the CCA detects that the current channel is idle, the user does not directly send a data frame, but first sends an RTS frame to reserve the channel;

[0047] S4: When a full-duplex visible light access point receives an RTS frame, it needs to send a busy tone to eliminate hidden nodes; that is, if other users perform CCA at the current moment, they will receive the busy tone signal sent by the access point and consider the current channel state If it is busy, backoff needs to be performed again to avoid conflicts;

[0048] S5: The user uses Short Interframe Space (SIFS) time to ...

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Abstract

The invention discloses a visible light full duplex continuous transmission random access method based on a channel reservation mechanism. Different from the CSMA / CA protocol in the existing IEEE802.15.7 standard, after a user executes idle channel estimation and detects that the channel is in an idle state, the user does not directly send a data frame, but firstly sends a RTS frame to reserve the channel, and sends the data frame after successfully reserving the channel. A full duplex visual light access point needs to broadcast busy tone to eliminate the hidden nodes when receiving the RTS frame or the data frame. Moreover, the user can directly execute CCA without executing random evasion again after successfully transmitting the data frame, therefore the conflict of the data frame is prevented, the time slot resources consumed by the random evasion mechanism are reduced, and the throughput and delay performance are improved. By adoption of the visible light full duplex continuous transmission random access method, the visible light hidden node problem is effectively solved, and meanwhile, the throughput and the delay performance of the visible light CSMA / CA protocol is optimized at the same time.

Description

technical field [0001] The present invention relates to the technical field of visible light communication, and more specifically, to a random access method for full-duplex continuous transmission of visible light based on a channel reservation mechanism. Background technique [0002] In recent years, with the maturity of light-emitting diode (Light Emitting Diode, LED) technology and the popularization of lighting, the visible light communication (Visible Light Communication, VLC) technology developed based on LED lights, because of its high transmission rate, green and environmental protection It has become one of the research hotspots in academia and industry. In order to promote the development of visible light communication technology, the Institute of Electrical and Electronic Engineers (IEEE) formulated the IEEE 802.15.7 standard in 2011. [1] , which describes in detail the relevant functions of visible light in the physical (Physical, PHY) layer and the medium acces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08H04B10/116
CPCH04B10/116H04W74/0808H04W74/0816H04W74/0833
Inventor 林培嵩张琳
Owner SUN YAT SEN UNIV
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