Router wireless network anti-interference

At present, wireless interference is the biggest impact on the wireless network, which seriously affects the stability and transmission speed of the wireless network. It is widely used in daily life, wireless Network interference also occurs constantly.

1. Large WLAN networks generally adopt a thin AP architecture.

The detection and reduction of wireless interference can be performed by scanning the AP that provides access services, or by a network composed of dedicated devices, it can even be used with a dedicated handheld RF Device for interference locating, which is generally suitable for precise locating on small networks or small scales. A large network usually requires the deployment of a dedicated network for monitoring. The device of this dedicated network is generally an AP in the Monitor status or a dedicated Sensor.

2. There are two ways to collaborate between a dedicated detection network and a network that provides access.

One is independent of each other, that is, the devices on the detection network and the devices connected to the network are managed by different controllers without any interaction. The other is the integration method, that is, the devices on the detection network and those on the access network are managed by the same controller. The servers on the detection network can also process the monitoring data from the AP on the access network, compared with an independent network, an integrated network features unified management, full use of network resources, and convenient detection and positioning.

3. Wireless Interference detection is to continuously monitor air port signals.

When the signal energy of the blank port exceeds a certain value, FFT is performed and then output to the WLAN receiver and various identifiers. The former checks whether the interference is a WLAN signal and further analyzes the MAC information, the latter determines the type of non-WLAN interference sources.

Iv. Wireless Interference avoidance and reduction can greatly improve the performance of WLAN networks. These technical features are widely implemented in the industry, the technical features further improve the entire network, reduce mutual interference, and improve the performance of the WLAN Network from details such as 802.11 message transmission or WLAN Network coordination. These features include packet transmission rate adjustment, packet-by-packet power control, and smart load balancing.

1. The message transmission rate adjustment is to dynamically calculate the transmission rate of each packet. Each Client can consider the signal strength and historical sending information of the Client each time it sends or re-transmits a message, dynamically calculate the appropriate sending rate of the current message.

When a message fails to be sent, different rate adjustment algorithms can be used according to different environments. In high-density environments, packet transmission failure is generally caused by a message conflict. When a very low packet is sent, this only causes the length of the empty port of the sent packet to grow and the impact range is greater, resulting in a greater possibility of conflict. This causes other APs to further reduce the transmission rate, making the entire network in a low-performance state. However, only high-speed retransmission is adopted. Even if multiple sending attempts fail, the upper-layer retransmission mechanism can be used without affecting the availability of upper-layer applications.

2. packet-per-package power control is the same as RRM's dynamic adjustment of AP Power to reduce interference between the same-frequency AP. When each message is sent, H3CAP adjusts the sending power of the current message according to the RF status of the Client. Package-by-package power control can minimize the impact of signal transmission and ensure AP coverage.

3. The smart Server Load balancer technology is different from the simple Server Load balancer technology. The wireless Controller determines the location of the Client. Only clients in the two AP overlapping regions can start the Server Load balancer, connect the Client to a low-Load AP. Smart load balancing can reduce the load of a single AP, thus reducing the proportion of Client conflicts under this AP.

In the future, with the development of WLAN transmission systems and the improvement of other hardware technologies, WLAN interference will have more ways to overcome and users will have a more perfect WLAN experience. However, for now, we can only minimize wireless interference sources.