Before the network deployment is delivered, people ran test at night time after work, and network speed
can always reach to the full speed of their ISP bandwidth.
However, after the wireless network is put into use at daytime, the user experience is unexpected terrible,
and employees continuously complain the slow network. However, the measured export bandwidth
utilization on the ISP router is low. So, what is the problem?
Signal strength (dBm) is the basic requirement for guaranteed service. However, the service is not
guaranteed to be good, even the signal quality is strong. Signal strength will finally be converted to SNR
(signal-to-noise ratio, ie the difference between signal and noise, in dB), and then reflect on user
experience.
How to understand the signal-to-noise ratio? For example, when you are at home, you can talk softly and
whispering, but in a pop concert, you have to talk loudly to the person even next to you. The reason is,
often times, and even if the signal is strong, but the background noise is also high, communication is still
hard. Even more, this company has three floors, and all floors are deployed in a high density, while no RF
power and channel planning were done!
When the network is put into operation, where does the noise come from?
Some of them come from some wireless devices, such as microwave ovens, Bluetooth phones, and non-
Wi-Fi co-frequency networks such as frequency hopping wireless networks, and radar interference, but
many of them are derived from the "Friends Wi-Fi Network" and the system in the system. The same-
frequency and adjacent-frequency interference of the manufacturer's Wi-Fi network can also be subdivided
into inter-AP interference, inter-terminal interference, and interference between terminals and APs,
especially in multi-user and multi-path environments.
How to Plan Deployment
How to carry out reasonable planning and design?
For wireless LAN, the key is to increase the channel multiplexing efficiency and air interface utilization
efficiency, thereby reducing media competition and radio frequency interference. The specific operation
requires two steps:
First Step: Plan Efficient Channel Multiplexing and Minimize Channel Sharing
What is channel multiplexing?
Channel multiplexing is the use of non-overlapping channels for coverage to reduce the behavior of co-
channel interference. Since the wireless spectrum resources are not infinite, it is necessary to use the
channel (or channel combination) multiple times when implementing full coverage of the wireless network
in enterprise deployment.
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