A multi-user MAC channel access method based on hopping pattern

Abstract

The invention discloses a multi-user MAC channel access method based on a hopping pattern, which provides a reliable, high-speed, and real-time channel access method for an indoor visible light communication system with few user nodes and a small network coverage. The hardware implementation based on the MAC layer access solution of the pattern concept is relatively convenient, and can be implemented by using existing commercial components. The hopping pattern control can be realized through software, which is low in cost and has commercial value. The hopping pattern concept proposed by the present invention can support dual functions of lighting and communication, and has practical value for the requirements of indoor visible light communication systems (meeting both indoor lighting and communication functions), and can be applied in production. The present invention is proposed for the characteristics of the indoor visible light communication system network. The hopping pattern reduces the channel interference of the adjacent network access point AP when the terminal first establishes channel access, replaces the RTS / CTS handshake protocol, simplifies the access process, and has the advantages of Feasibility and effectiveness.

Description

technical field [0001] The invention belongs to the field of wireless optical communication network control, in particular to a multi-user MAC channel access method based on hopping pattern. Background technique [0002] The IEEE 802.15.7-2011 standard was released in September 2011. This standard describes the use of visible light communication (VLC) in a wireless personal area network (WPAN), and defines the physical layer (physical layer) of VLC. , PHY) and MAC layers. VLC uses visible light to communicate in the optically transparent medium, and the range of the optical spectrum is 380-780nm in wavelength. The standard requires that the transmission rate is sufficient to support audio, video, and multimedia services. Since the VLC system needs to coexist with external lighting and other light technologies, the main research at home and abroad includes the mobility of visible light links, compatibility with visible light infrastructure, and noise and interference due to...

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Problems solved by technology

[0013] At present, research at home and abroad is focused on the network characteristics of 802.15.7 MAC layer competitive access, and has not been closely related to the network characteristics of the protocol in the indoor environment. Therefore, this patent proposes a characteristic for the indoor environment: few user nodes , the network coverage is small, the transmission distance is short, the delay is small, the traffic volume is random, and the adjacent user nodes have no carrier detection. A method for multi-user MAC channel access is given, and a concept of hopping pattern is proposed, which is applied to In the MAC channel access method of this patent

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