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Fat AP and Cloud AP V200R008C00 CLI-based Configuration Guide

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Band Steering

Band Steering

Overview

Most STAs support both 5 GHz and 2.4 GHz frequency bands and usually associate with the 2.4 GHz radio by default when connecting to the network. As a result, the 2.4 GHz frequency band with fewer channels is congested, heavily-loaded, and has severe interference. The 5 GHz frequency band with more channels and less interference is not well used. When the 2.4 GHz frequency band has many users or severe interference, the 5 GHz frequency band can provide better access service for wireless users. To connect the STAs to the 5 GHz radio, users need to manually select the 5 GHz radio.

The band steering function enables an RU to steer STAs to the 5 GHz radio first, which reduces traffic load and interference on the 2.4 GHz radio and improves user experience.

NOTE:

To implement the band steering function, an RU must have the same SSID and security policy on the 5 GHz and 2.4 GHz radios.

Implementation

Figure 18-7 shows the implementation of band steering, involving two phases:
Figure 18-7  Band steering

  1. 5G-prior access

    Before the number of access STAs on an RU exceeds the start threshold for load balancing between radios, the RU preferentially connects a new STA to the 5 GHz radio.

    As shown in the figure, when the RU receives a Probe Request frame from the STA (STA_1), it checks the radio receiving the Probe Request frame. If the Probe Request frame is received by the 2.4 GHz radio, the RU does not return a probe response. If the Probe Request frame is received by the 5 GHz radio, the RU returns a probe response. The STA then associates with the 5 GHz radio, and the central AP records the supported frequency band of the STA as the 5 GHz frequency band.

    If the RU receives Probe Request frames continuously from the 2.4 GHz radio but does not receive any Probe Request frame from the 5 GHz radio, the RU returns a Probe Response frame through the 2.4 GHz radio. The STA then associates with the 2.4 GHz radio, and the central AP records the supported frequency band of the STA as the 2.4 GHz frequency band.

    When STA_1 associates with the RU again, the RU first checks the frequency band supported by the STA. If STA_1 supports only the 2.4 GHz frequency band, the RU immediately permits the STA to access the 2.4 GHz radio.

  2. Load balancing between radios

    After the number of access STAs on an RU exceeds the start threshold for load balancing between radios, the RU determines the radio to which the STA connects based on the difference between the number of access STAs on the 2.4 GHz radio and that on the 5 GHz radio.

For example, if a STA requests to associate with the RU on the 2.4 GHz radio but the number of access STAs on the RU has exceeded the start threshold for load balancing between radios, the RU implements load balancing between the 2.4 GHz and 5 GHz radios according to the value computed based on the formula: (Number of access STAs on the 5 GHz radio – Number of access STAs on the 2.4 GHz radio)/Number of access STAs on the 5 GHz radio x 100%. If the value is greater than the load difference threshold, the RU preferentially associates with the STA on the 2.4 GHz radio; otherwise, the RU preferentially associates with the STA on the 5 GHz radio.

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Updated: 2019-01-11

Document ID: EDOC1000176006

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