Configuration Guide Configuring Band Select
2 Configuring Band Select
2.1 Overview
Band Select is a technology for optimizing access band distribution for STAs on a WLAN.
The Band Select function leads dual-band STAs to access the higher-capacity 5 GHz band to reduce the pressure on the
2.4 GHz band and improve user experience.
The Band Select function is suitable for the following scenario: dual-band APs are used to provide coverage, and the two
RF interfaces of the APs operate at 2.4 GHz and 5 GHz respectively; meanwhile, a WLAN is mapped to the two RF
interfaces of the APs and provides access service at the two bands simultaneously.
Protocols and
Standards
IEEE 802.11
2.2 Applications
N/A
2.3 Features
Basic Concepts
IEEE802.11 Communication Band
IEEE802.11 comprises two communication bands:
2.4 GHz (2.4 to 2.4835 GHz), where 802.11b/g/n resides
5 GHz (5.15 to 5.35 and 5.725 to 5.825 GHz), where 802.11a/n resides
With the popularization of WLANs, there are more and more wireless users. Many users use dual-band wireless clients
(STAs) supporting both 2.4 GHz and 5 GHz. However, 802.11b/g is more widely applied than 802.11a. Many dual-band
STAs use 2.4 GHz, causing congestion of 2.4 GHz and waste of 5 GHz.Actually, the 5 GHz band has a greater access
capacity. The 2.4 GHz band has up to three non-overlapped channels, whereas the 5 GHz band provides more
non-overlapped channels.
STA Scanning
There are two modes, namely, passive scanning and active scanning.
Passive scanning: An STA monitors beacon frames sent by nearby APs on all channels of all supported bands. The
beacon frames contain WLAN access information. The STA parses the information to learn about the WLANs that
are available nearby.
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