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. Based upon an indoor visible light communication system with few user nodes and a small network coverage range, a reliable, high-speed and real-time channel access method is provided. Hardware upon which an MAC layer access scheme of a hopping pattern concept proposed by the invention is based is implementedconveniently, and can be implemented by using an existing commercial component, and the hopping pattern control can be implemented by software, so the cost is low and the method has a commercial value; the hopping pattern concept proposed by the invention can support illumination and communication dual functions; for requirements (not only is indoor illumination met, but a communication functionis also achieved) of the indoor visible light communication system, the method has a practical value and can be applied to production; the multi-user MAC channel access method is proposed based on characteristics of an indoor visible light communication system network; and the hopping pattern reduces channel interference between adjacent network APs when a terminal initially establishes channel access, so an RTS/CTS handshaking protocol is replaced, the access procedures are simplified, and the multi-user MAC channel access method has the feasibility and the 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, domestic and foreign researches are all focused on the network characteristics of 802.15.7 MAC layer competitive access, and have not closely related to the network characteristics of the protocol in the indoor environment. Therefore, this patent proposes a characteristic for the indoor environment: fewer 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 this paper. Patented MAC channel access method in

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