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Configuration Guide - WLAN-AC

S5700 and S6720 V200R012C00

This document describes the configurations of WLAN, including WLAN Service Configuration, Radio Resource Management, Roaming, WLAN QoS, WLAN Security, WDS, Mesh, Location, Hotspot 2.0, Dual-Link Cold Backup, N+1 Backup.
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Summary of Radio Resource Management Configuration Tasks

Summary of Radio Resource Management Configuration Tasks

Table 6-1 describes the radio resource management configuration tasks.

Table 6-1  Radio resource management configuration tasks

Scenario

Description

Task

Configure interference detection

Wireless channels of WLANs are vulnerable to interference in surrounding radio environments, and the service quality is therefore degraded. If interference detection is configured, a monitor AP can know the radio environment in real time and report alarms to an AC in a timely manner.

Interference detection enables an AP to detect AP co-channel interference, AP adjacent-channel interference, and STA interference.
  • AP co-channel interference: Two APs working on the same frequency band interfere with each other. For example, on a large-scale WLAN (a university campus network), different APs often use the same channel. When there are overlapping areas among these APs, co-channel interference exists, degrading network performance.

  • AP adjacent-channel interference: Two APs with different center frequencies have overlapping areas, resulting in adjacent-channel interference. Therefore, if APs are placed too close to each other or they have strong signals, more noise will be produced, degrading network performance.

  • STA interference: If there are many STAs that are managed by other APs around an AP, services of the STAs managed by the local AP may be affected.

Configuring Interference Detection

Configure radio calibration

On a WLAN, operating status of APs is affected by the radio environment. For example, a large-power AP can interfere with adjacent APs if they work on overlapping channels. The radio calibration function can dynamically adjust channels and power of APs managed by the same AC to ensure that the APs work at the optimal performance.

Depending on the scope of radio calibration, two radio calibration modes are available:
  • Global radio calibration: The AC dynamically allocates channels and power to all the APs in an AP region. Generally, this calibration mode is used on a newly deployed WLAN or a WLAN where the radio environment deteriorates in most areas.
  • Partial radio calibration: The AC dynamically allocates channels and power to specified APs. Generally, this calibration mode is used when new APs are added to the network or the radio environment deteriorates in some areas.

Configuring Radio Calibration

Configure load balancing

Load balancing can evenly distribute AP traffic loads to ensure high bandwidth for each STA. The load balancing function applies to wireless networks with high user densities to ensure proper access of STAs.

Configuring Load Balancing

Configure band steering

When an AP and STA support both 5 GHz and 2.4 GHz frequency bands, the AP can steer the STA to the 5 GHz radio first.

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 Internet. To connect the STAs to the 5 GHz radio, you need to manually select the 5 GHz radio. 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. The band steering function enables APs to steer STAs to the 5 GHz radio first.

Configuring Band Steering

Configure High Density Boost

Dense AP deployment is an important measure to improve user experience in scenarios with high-density users and a high volume of traffic, such as sports stadiums, libraries, lecture halls, conference sites, and dormitories.

A WLAN has only three non-overlapping channels on the 2.4 GHz frequency band. When APs are deployed densely, multiple APs have to work on the same channel, resulting in co-channel interference. This interference degrades network performance. The High Density Boost function enables an AP to adjust the antenna, power and signal receive threshold using specific algorithms. This function reduces co-channel interference between APs and improves users' Internet experience.

This function applies to high-density WLANs where APs are deployed densely, such as sports stadiums, libraries, lecture halls, dormitories, and conference sites.

Configuring Dynamic EDCA Parameter Adjustment

Configuring User CAC

Configuring Automatic Per Packet Power Adjustment

Configure smart roaming

This configuration applies to scenarios where STAs connected to APs have weak signals or low rates. It can improve service experience of online STAs.

The smart roaming function allows an AP to send a Disassociation frame to STAs whose signal strength or access rate is lower than the specified threshold so that the STA can reconnect to the network.

Configuring Smart Roaming

Configure automatic per packet power adjustment

You can configure automatic per packet power adjustment on WLANs with good signal coverage to reduce AP power consumption and interference to surrounding devices.

Configuring Automatic Per Packet Power Adjustment

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Updated: 2018-12-24

Document ID: EDOC1100038361

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