Channel multiplexing method and system, channel multiplexing device and access point

Abstract

The embodiment of the invention relates to the field of wireless communication, and particularly relates to a channel multiplexing method and system, a channel multiplexing device and an access point, and aims at solving a hidden node problem and an exposed node problem existing in the prior art. The channel multiplexing method provided by the embodiment of the invention comprises that: aiming at one target access point, the access point which is adjacent to the logic of the target access point is confirmed, and the access point which is not adjacent to the logic of the target access point is confirmed; the target access point and the access point which is adjacent to the logic of the target access point are arranged to use a same channel to perform data transmission within different time ranges; and the target access point and the access point which is not adjacent to the logic of the target access point are arranged to use the same channel to perform data transmission. The hidden node problem and the exposed node problem existing in the prior art are solved by the embodiment of the invention so that interference is avoided and efficiency in channel multiplexing is enhanced.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a channel multiplexing method, system, channel multiplexing device and access point. Background technique [0002] The working frequency band of WLAN (Wireless Local Area Networks, wireless local area network) 2.4GHZ is 2.4GHZ~2.4835GHZ, and there are 13 sub-channels. For the multiplexing of the same channel, the carrier sense mechanism of 802.11CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance, carrier sense multiple access / collision avoidance) is adopted. The carrier sense of 802.11CSMA / CA includes physical Carrier sensing and virtual carrier sensing, and determine the occupancy status of the channel according to the results obtained from physical carrier sensing and virtual carrier sensing. For physical carrier sensing, when a station has data to send, it first monitors the channel. If it finds that the channel is not occupied by other stations, the station...

AI Technical Summary

Problems solved by technology

[0003] The carrier sense mechanism of 802.11CSMA / CA is likely to cause hidden node problems, such as figure 1 For example, such as figure 1 As shown, the coverage areas of AP1 and AP4 overlap. If AP1 and AP4 hide nodes from each other (that is, AP1 and AP4 cannot see each other, or AP1 and AP4 cannot detect (perceive) each other’s transmission signals), and AP1 and AP4 It is an AP with the same frequency, that is, AP1 and AP4 use the same channel to transmit data. Since AP1 and AP4 cannot hear each other's transmission signals, AP1 and AP4 will use the same channel to transmit data within the same time range, so they are located where AP1 and AP4 overlap. The terminals in the coverage area will receive the signals of AP1 and AP4 at the same time, causing conflicts

[0004] The carrier sense mechanism of 802.11CSMA / CA is likely to cause the problem of exposed nodes, such as figure 2 For example, such as figure 2 As shown, the coverage areas of AP1 and AP4 do not overlap. If AP1 and AP4 expose nodes to each other (that is, AP1 and AP4 can see each other, or AP1 and AP4 can detect each other's transmission signals), and AP1 and AP4 are on the same frequency AP, since AP1 and AP4 can detect each other's transmission signals, AP1 and AP4 will not use the same channel for data transmission within the same time range, and AP1 and AP4 could have used the same channel for the same time range due to non-overlapping coverage areas Data transmission within the channel, resulting in a large loss of channel capacity

[0005] To sum up, the carrier sense mechanism of 802.11CSMA / CA is easy to cause the hidden node problem and the exposed node problem, and there is no solution yet

Images