Media access control method based on WLAN system in 802.11ac protocol

Abstract

The invention discloses a media access control method based on a WLAN system in an 802.11ac protocol. The method mainly is used for solving the problem of low spectrum utilization rate resulted from overlapped basic service sets. The method comprises that a wireless access point AP invokes a carrier monitoring mechanism on a master channel so as to determine the busy and idle states of the master channel; when the master channel is in an idle condition, the wireless access point and stations STA access the master channel by a distributed coordination functional channel access method; when the master channel is in a busy condition, the wireless access point selects a first channel in non-master channels as a virtual master channel and sends system notice information SNI to the stations in a basic service set in which the wireless access point is located; SNI copies are sent to the other non-master channels; and the stations access the non-master channels on the virtual master channel according to a point coordination functional interframe interval channel access algorithm. According to the method provided by the invention, the non-master channel is utilized fully; the spectrum utilization rate and system throughput are improved; and the method can be used for optimizing the MAC layer protocol in the 802.11ac protocol.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a medium access control method of a WLAN system, which can be used to optimize the MAC layer protocol in the 802.11ac protocol and solve the problem of insufficient frequency spectrum utilization caused by overlapping basic service sets. Background technique [0002] Driven by the rapid increase of new wireless devices and applications, IEEE802.11 wireless LANs are increasingly deployed in limited environments, where different basic service sets (BSSs) overlap in space. Interference between the adjacent BSS access point AP needs to work in non-overlapping frequency bands, but in many cases this condition cannot be met. With the development of the new IEEE802.11ac network, the overlapping phenomenon of BSSs with different operating frequency bands will become more and more common, which leads to the OBSS problem of partial overlapping frequency bands. I...

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Problems solved by technology

Therefore, the network throughput loss between BSSs with partially overlapping frequency bands is more significant than that with the same frequency bands, because the latter is only affected by interference caused by OBSS problems, while the former also suffers from the problem of underutilization of spectrum caused by OBSS , leading to a significant reduction in network throughput

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