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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).
Smart Roaming

Smart Roaming

Overview

Some terminals on networks have low roaming aggressiveness. As a result, they stick to the initially connected APs regardless of whether they move far from the APs, and have weak signals or low rates. The terminals fail to roam to neighboring APs with better signals. They are called sticky terminals.

Sticky terminals may bring the following problems:
  • Poor service experience: The terminals stick to weak-signal APs, causing a sharp decrease in the wireless channel rate.
  • Channel performance degradation: The terminals have poor signals or low rates, and frequent packet loss and retransmissions occur. As a result, the terminals occupy the wireless channels for a long time, which prevents terminals with good signals from using the wireless channel for enough time.

Smart roaming addresses the problems. After smart roaming is configured, the system actively steers the terminals to neighboring APs with better signals.

Benefits of smart roaming:
  • Improved performance

    • Common coverage scenarios: The smart roaming function allows terminals with poor signals to roam to better APs. The service experience of the terminals and overall wireless channel performance are therefore improved.
    • High-density coverage scenarios: Terminals usually have good signals in the scenarios but may not connect to the optimal APs. The smart roaming function allows the terminals to associate with the optimal APs, which greatly improves the wireless channel performance.
  • Traffic load balancing

    With smart roaming, each terminal associates with the nearest AP, enabling APs to load balance traffic.

Working Principle

Figure 11-7 shows the working principle of smart roaming.
Figure 11-7  Smart roaming

When STA_1 associates with AP_1, AP_1 collects SNR and access rate information of STA_1 in real time. When STA_1 moves from Area1 to Area2, AP_1 detects that the signal strength of STA_1 remains lower than the threshold in a certain period. In this situation, AP_1 forcibly disconnects STA_1 so that STA_1 can roam to AP_2.

Due to individual differences, some terminals do not roam to APs with better signals but stick to the initially associated APs even if they are disconnected forcibly. These terminals may not initiate association requests if forced offline. The AP will record these terminals unable to roam. When an "unable to roam" terminal is classified as a sticky terminal, the AP does not trigger roaming of the terminal in a specified period to prevent service interruption.

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Updated: 2019-01-11

Document ID: EDOC1000176006

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