How does the wireless network prevent interference?

With the popularity of wireless networks, especially in the residential upstairs, there is a large number of wireless signals, interference between the situation has seriously affected the stability of the wireless network and transmission speed, in response to this situation, we analyze how to prevent interference to achieve the most stable wireless network environment.

First, the detection and reduction of wireless interference can be used to provide access to the AP to scan, can also be composed of specialized equipment network to carry out, or even with a dedicated hand-held RF equipment to carry out interference positioning, generally applicable to small networks or small range of accurate positioning. And a large network, the general need to deploy a dedicated network to monitor, this specialized network, its equipment is generally in the monitor state of AP, or special sensor.

Second, the first is the independent way, that is, detection of network equipment and access network equipment is managed by different controllers, the two have no interaction;

The other is an integrated approach, that is, detection network equipment and access network equipment is managed by the same controller, detection network server can also handle access to the AP monitoring data from the network, integrated mode of network compared to the independent way of the network, with the ability to unified management, full use of access to the network resources, Detection and positioning is convenient and other characteristics.

Three, the empty port signal energy exceeds a certain value, on the FFT transformation, and further output to the WLAN receiver and various recognizers, the former judge whether the interference is WLAN signal, and further analysis of MAC information, the latter to judge the type of non-WLAN interference source.

Four, wireless interference to avoid and reduce to WLAN network performance can bring great performance improvement, the industry has generally achieved these technical characteristics, Technical characteristics from the 802.11 message transmission or WLAN coordination and other details to further improve the entire network, reduce mutual interference, to improve the performance of WLAN network has a good effect. These technical features include: packet transmission rate adjustment, packet power control and intelligent load balancing technology.

1, the message transmission rate adjustment is the dynamic calculation of each message send rate, can be for each client each send a message or retransmission message, will consider the client's signal strength, historical sending information, dynamic calculation of the current message appropriate transmission rate.

2, when sending a failure, can be based on different environments using different rate adjustment algorithm, because the high density environment, the message transmission failure is generally caused by the message conflict, the use of very low send message, will only cause the message to send a long length, the impact of a larger range, resulting in greater possible conflict, Causing the other AP to further reduce the transmission rate, so that the entire network in a low performance state. And only the use of high-speed retransmission, even if the multiple send unsuccessful, you can also use the top of the retransmission mechanism, ultimately does not affect the availability of upper application.

3, the package power control and RRM dynamic adjustment of AP power is the same as the purpose of reducing the interference between the same frequency AP. H3cap in sending each message, will adjust the current message transmission power according to the client's RF state. The packet power control can minimize the range of the signal sending effect, and also can guarantee the coverage of AP.

With the development of technology, wireless routers will be based on the location of the client to judge, only in two AP overlapping areas of the client to start a balanced, so that its client access to the load-less AP, which greatly reduces the mutual interference.