Channel access method, device and system

Abstract

Disclosed in the present invention are a method, an apparatus and a system for channel access. Through simplifying the monitoring process for an STA (station), the satisfaction of time synchronization when a plurality of STAs access channels can be supported so as to avoid signal interference between adjacent frequency bands. The method comprises: monitoring the channel state of a channel by a station (STA), the channel including at least two sub-channels; in the case of monitoring the channel at an idle state, sending an access request frame to an access point (AP) through at least one sub-channel of the channel; if receiving an access response frame fed back by the AP, and the access response frame including identification information and channel resource allocation information of the station, then the channel access is successful; and the identification information and channel resource allocation information of the station is used to indicate that the AP allocates channel resources for data transmission to the station.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a channel access method, device and system. Background technique [0002] For the data transmission process of the wireless local area network, the IEEE802.11 agreement has carried on the detailed regulation to it. In a wireless local area network, it generally includes an access point (AP, Access Point) and multiple stations (STA, Station). If the STA has data to send, it must first send the data to the AP, and then be forwarded by the AP. to other network nodes. Therefore, when multiple STAs in a wireless local area network have data to be sent at the same time, they will inevitably compete for channel resources. [0003] The IEEE802.11 protocol stipulates that all STAs use the same channel to send access request frames to compete for channel resources. Therefore, in a wireless local area network, when multiple STAs send access request frames at the sam...

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Problems solved by technology

[0003] The IEEE802.11 protocol stipulates that all STAs use the same channel to send access request frames to compete for channel resources. Therefore, in a wireless local area network, when multiple STAs send access request frames at the same time, collisions will occur, so that the AP may not be able to correctly An access request frame sent by any STA is received

One solution is to divide the channel into several frequency-domain sub-channels, and STAs can compete for channel resources on different sub-channels by monitoring the busy / idle status of each sub-channel. / idle state, which leads to a complicated STA monitoring process, and when multiple STAs perform channel access, there is a problem of time asynchrony, which leads to serious adjacent band interference

[0004] For example: if the channel is divided into two sub-channels, when STA1 detects that sub-channel 1 is idle, STA1 sends an access request frame to the AP. At this time, when STA1 sends the access request frame, STA2 listens to Sub-channel 2 is in an idle state, and STA2 sends an access request frame to the AP. Then, STA1 and STA2 have a time asynchronous problem when accessing the channel; In the process of processing the sent access request frame, the access request frame sent by STA2 is received, then the access request frame sent by STA2 causes serious interference to the access request frame sent by STA1, that is, the access request frame on subchannel 2 The signal interferes with the signal on sub-channel 1. Since each sub-channel occupies a certain frequency domain bandwidth, the signal interference in adjacent frequency bands is serious.

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