It is well known that when interference sources exist around an AP, wireless signals are affected by these interference sources, resulting in signal transmission.
Let's take a look at a case.Symptom
2.4 GHz channels have severe interference, and some users have poor Wi-Fi experience.
Fault Location
Settled APs are installed in corridors to cover rooms and are close to the carrier's mushroom-like antennas. 2.4 GHz channel 1 is close to the carrier's frequency band, so the signal interference is high, causing weak signal coverage.
Solution
Adjust the installation positions of APs and keep the APs away from the carrier's indoor antennas. Configure 5 GHz-prior access and increase the 5 GHz radio power to increase the proportion of 5 GHz access users.
Summary
The channels used by carrier signals, mobile phone hotspots, and home routers often overlap with 2.4 GHz channels, causing greater interference to 2.4 GHz channels with poor channel resources. With the promotion of 802.11ac and 802.11ax, most terminals in the market support 5 GHz radio, so ensuring the 5G radio coverage rate is a fundamental means of optimizing user experience.
Alternatively, antenna spacing can be properly controlled according to actual scenarios to avoid signal interference. The following common guidelines are recommended:
[Outdoor scenarios]
If antennas need to be installed on different poles and face opposite directions, ensure that the horizontal distance between the antennas is at least 1.5 m. If antennas need to be installed on the same pole and face the same direction, ensure that the vertical distance between the antennas is at least 5 m.
Keep antennas at least 2 km away from 4G signal transmitters (towers).
[Indoor scenarios]
Ensure that antennas are deployed at least 7 m away from each other. In common semi-open indoor areas, ensure that APs are around 20 m away from each other.
Keep antennas at least 2 m away from carriers' 4G antennas.
Keep antennas away from electronic equipment that may cause radio interference, such as microwave ovens.
[Vehicle-mounted scenarios]
Deploy antennas at least 5 m away from each other.
Keep antennas at least 2 m away from carriers' 4G antennas.
[Trackside installation scenarios]
At the same trackside, place antennas with the same direction at least 50 m away from each other, and place co-located antennas facing opposite directions at least 20 cm away from each other.
Ensure that the height difference between trackside antennas and vehicle-mounted antennas do not exceed 0.5 m.
