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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).
User CAC

User CAC

On WLANs where many users exist, such as WLANs in high density scenarios, users compete fiercely to occupy the channels as the number of online users increases. As a result, network quality deteriorates. To ensure network access experience of online users, configure the user CAC function. The user CAC function 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 provisioning of high-quality network access services.

CAC uses two types of thresholds to respectively control access of new users and roaming users. 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 access of the new user and hides its SSID to prevent access of new users to 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 the roaming users. However, if too many users roam to the AP, experience of online users of the AP is degraded. Therefore, a CAC threshold for roaming users is required. When a user roams to an AP, the AP accepts the user as long as 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:

    CAC based on channel usage uses a complex algorithm but is accurately implemented to ensure service quality. This mode 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 not, the AP allows the user to go online. If so, the user is denied access.
    • If the channel usage reaches the threshold after the new user goes online, the AP will reject access requests from other 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 access of the user and generates an alarm.
    • The AP periodically detects the channel usage of the radio. Once the channel usage falls below the threshold set for new users, the AP sends a clear alarm and unhides the SSID, allowing new users to get online.
  • Based on the number of users:

    CAC based on the number of users is less accurate but uses a simple algorithm. This mode 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 not, the AP allows the user to go online. If so, the user is denied access.
    • If the number of online users reaches the threshold after the user goes online, the AP will reject access requests from other new users, send 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 access of the user and generates 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 get online.
  • Based on terminal SNR

    SNR-based UAC controls access from weak-signal users, 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 not, the AP allows the user to go online. If so, the user is denied access.

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Updated: 2019-01-11

Document ID: EDOC1000176006

Views: 116958

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