Channel access method and device

Abstract

Embodiments of the invention provide a channel access method and a channel access device. The channel access method is applied to a network system comprising at least one access point and a pluralityof stations which are in communication connection, wherein the plurality of stations connected with the same access point form a plurality of station groups. The channel access method comprises the steps of: broadcasting a beacon frame by the access point, wherein the beacon frame comprises target identifiers of currently active station groups; after the beacon frame is received by the station needing to transmit data in each station group, judging whether the station group to which the station belongs is the currently active station group according to the identifier of the station group to which the station belongs and the target identifiers; if it is judged that the station group to which the station belongs is not the currently active station group, waiting, by the station needing to transmit data, to receive a beacon frame transmitted by the access point again; and if it is judged that the station group to which the station belongs is the currently active station group, competing for a channel according to a preset rule by the station needing to transmit data, so as to access the channel to perform data transmission. The channel access method of the invention has the beneficialeffects that: the stations are divided into groups, and the each group of stations performs channel competition and data transmission during a corresponding exclusive transmission time period, thereby reducing a collision rate.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a channel access method and device. Background technique [0002] In recent years, a WLAN (Wireless Local Area Network, wireless local area network) has become one of the mainstream ways of network connection, and more and more users use the WLAN to access the network. According to Cisco's Global Mobile Data Forecast, by 2019, traffic generated over WLANs will account for 51 percent of total traffic. Such a rapid development requires more and more WLAN performance in various aspects, such as higher system throughput, more users and higher channel utilization. [0003] IEEE 802.11 series standards have become the mainstream standards of WLAN due to their simplicity and easy implementation. It mainly implements channel sharing through the 802.11DCF (Distributed Coordination Function) mechanism. Among them, CSMA / CA (Carrier Sense Multiple Access with Collisi...

AI Technical Summary

Problems solved by technology

When the number of stations is small, this mechanism can reduce the collision rate to a certain extent, but as the number of stations increases, the collision rate becomes higher and higher, seriously affecting the performance of the system

Moreover, the BEB mechanism also provides all stations with the same opportunity to access the channel without considering the differences between stations, resulting in problems such as abnormal performance and increased delay, which further deteriorates the performance of the system

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