Introduction to anti-interference of wireless routers

With the popularization of wireless networks, especially in residential buildings, there are a large number of wireless signals. mutual interference seriously affects the stability and transmission speed of the wireless network, we will analyze how to prevent interference to achieve the most stable wireless network environment.

1. Wireless Interference detection and reduction can be performed either by using an AP that provides access services or by a network composed of specialized 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. They are independent of each other, that is, the devices on the detection network and those on the access network are managed by different controllers, and there is no interaction between the two;

The other method is integration. 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. When the signal energy of an empty 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 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.

2. When sending fails, different rate adjustment algorithms can be used in different environments. In high-density environments, packet sending failure is generally caused by Packet Conflict, when a very low packet is sent, only the length of the blank port of the sent packet changes, and the impact scope is greater, resulting in a greater possibility of conflict, causing other APs to further reduce the transmission rate, make 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.

3. 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.

With the development of technology, the wireless router will judge based on the location of the Client. Only clients in the overlapping regions of the two AP can start the balancing and connect their clients to the AP with a light load, this greatly reduces mutual interference.