Anti-interference coordination system applied to dense WLAN

Abstract

The invention discloses an anti-interference coordination system applied to a dense WLAN, which at least comprises the following steps that: a WLAN controller (WLC) notifies two APs with overlapped areas to group stations according to the number of BSS colors and feeds back grouping information and position information of the stations to the WLC; after the WLC receives the grouping information, the allowable maximum transmission rate of each group is calculated; the WLC calculates the receiving time of the MAC layer of the station according to the payload length (MSDU length) of the data packet of one-time downlink transmission of the AP; the WLC generates a scheduling table used for scheduling the time when the stations in the overlapping area start to compete for the channels according to the receiving time; the WLC informs the AP of the scheduling table, the MSDU length of the primary downlink transmission and the transmission rate; and the AP negotiates the time for waking up the station to compete for the channel with the station according to the parameters notified by the WLC. According to the invention, channel contention can be reduced by adopting BSS color grouping.

Description

Technical field [0001] The present invention relates to the field of communication technology, and more specifically to an anti-interference coordination system applied to dense WLAN. Background technique [0002] IEEE 802.11ax is based on the traditional Distributed Coordination Function (DCF) mechanism, which listens first and sends it later to avoid interference between devices in a WLAN. However, when two WLANs running on the same frequency band are within the sensing range of each other, even if the device has little interference or the transmission causes little interference to other devices, it needs to be sent when the channel is idle after listening. Resources are wasted. In a dense deployment scenario, the interference between adjacent WLANs causes more serious waste of resources, and the network throughput rate further deteriorates, resulting in the waste of scarce spectrum, and leading to fierce channel contention and severe co-channel interference. The traditional ...

AI Technical Summary

Problems solved by technology

But in fact, adjusting the transmit power and carrier sense range will change the association of the stations, and even cause the stations that are originally associated but at the edge of the BSS to have no AP to associate with.

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