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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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User CAC

User CAC

On WLANs where many users exist, such as in high density scenarios, as the number of online users increases users compete fiercely to occupy channels. As a result, network quality deteriorates. To ensure online users' network access, configure the user Calling Access Control (CAC) function. User CAC allows an AP to control user access based on the thresholds specified according to the radio channel usage, number of online users, or terminal SNR, which enables high-quality network access services.

CAC uses two types of thresholds to control access of new users and roaming users respectively. When a new user connects to the AP, the AP checks whether the current channel usage or the number of online users reaches the threshold set for new users. If so, the AP denies the new user access and hides its SSID to prevent new users from accessing WLAN services provided by the radio. To ensure that online users of another AP can roam to the current AP, some resources are reserved for roaming users.

However, too many users roaming to the AP deteriorated online users' experience of the AP. Therefore, a CAC threshold for roaming users is required. When a user roams to an AP, the AP accepts them provided the number of users on the AP does not reach the CAC threshold for roaming users.

CAC is implemented in the following modes:
  • Based on channel usage:

    This implementation mode uses a complex algorithm but is accurately implemented to ensure service quality. It is recommended when service types and traffic volumes differ greatly among users.
    • When receiving a new access request, the AP calculates the channel usage on the current radio and checks whether the channel usage reaches the threshold set for new users. If so, the user is denied access. If not, the AP allows the user to go online.
    • If channel usage reaches the threshold after the new user goes online, the AP rejects access requests from new users and hide its SSID. When a user roams to the AP, the AP checks whether the current channel usage reaches the threshold set for roaming users. If so, the AP denies the user access and sends an alarm.
    • The AP periodically detects radio channel usage. Once channel usage falls below the threshold set for new users, the AP sends a clear alarm and unhides the SSID, allowing new users to go online.
  • Based on the number of users:

    This implementation mode is less accurate but uses a simple algorithm. It is recommended when most users have the same type of services and similar service traffic volumes.
    • When receiving a new access request, the AP calculates the number of online users on the current radio and checks whether the number reaches the threshold set for new users. If so, the user is denied access. If not, the AP allows the user to go online.
    • If the number of online users reaches the threshold after the user goes online, the AP rejects access requests from new users, sends an alarm, and hide its SSID. When a user roams to the AP, the AP checks whether the channel usage reaches the threshold set for roaming users. If so, the AP denies the user access and sends an alarm.
    • When the number of online users falls below the threshold set for new users, the AP sends a clear alarm and unhides the SSID, allowing new users to go online.
  • Based on the terminal SNR

    SNR-based UAC controls access from weak-signal users, and is applicable to scenarios where the WLAN has good signal coverage and weak signals only at the edge of WLAN coverage areas at the edge of WLAN coverage areas.

    When receiving a new access request, the AP checks whether the terminal SNR reaches the threshold specified for new users. If so, the user is denied access. If not, the AP allows the user to go online.

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Updated: 2018-12-24

Document ID: EDOC1100038361

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