Licensing Requirements and Limitations for Radio Resource Management

Involved Network Elements

APs mentioned in this document are Huawei AP products. You are advised to use Huawei APs to connect to the AC.
You can run the display ap-type all command to check the default AP types supported by the device.
When central APs and RUs are used, ensure that their versions are the same. For example, if the central AP version is V200R007C10, the RU version must be V200R007C10.

**Table 1** Mapping between switch versions and AP versions
Product Software Version	AP Software Version
V200R019C10	V200R019C10 V200R019C00 V200R010C00 V200R009C00 V200R008C10 V200R008C00 V200R007C20 V200R007C10 V200R006C20 V200R006C10
V200R019C00	V200R019C00 V200R010C00 V200R009C00 V200R008C10 V200R008C00 V200R007C20 V200R007C10 V200R006C20 V200R006C10
V200R013C00	V200R010C00 V200R009C00 V200R008C10 V200R008C00 V200R007C20 V200R007C10 V200R006C20 V200R006C10
V200R012C00	V200R009C00 V200R008C10 V200R008C00 V200R007C20 V200R007C10 V200R006C20 V200R006C10
V200R011C10	V200R008C10 V200R008C00 V200R007C20 V200R007C10 V200R006C20 V200R006C10
V200R011C00	V200R007C20 V200R007C10 V200R006C20 V200R006C10
V200R010C00	V200R007C10 V200R006C20 V200R006C10
V200R009C00	V200R006C20 V200R006C10
V200R008C00	V200R005C30 V200R005C20 V200R005C10
V200R007	V200R005C20 V200R005C10
V200R006	V200R005C00

Licensing Requirements

When the device is used as a WLAN AC, the number of online APs supported by the device is controlled by licenses. The device supports a maximum of 16 online APs. To increase the number of online APs supported by the device, apply for and purchase a license from the agent.

AP resource license-1AP for WLAN access controller
AP resource license-16AP for WLAN access controller
AP resource license-32AP for WLAN access controller
AP resource license-64AP for WLAN access controller
AP resource license-128AP for WLAN access controller
AP resource license-512AP for WLAN access controller

For details about how to apply for a license, see Obtaining Licenses in the S1720, S5700, and S6700 Series Switches License Usage Guide.

Feature Support in V200R019C10

This feature is supported only by the following models: S5720-HI, S5730-HI, S5731-H, S5731S-H, S5732-H, S6720-HI, S6730S-H, and S6730-H.

Feature Limitations

Configuring Radio Calibration

Radio calibration does not take effect on radios enabled with WDS or Mesh functions.
When configuring 40 MHz or 80 MHz calibration bandwidth, check whether channels of the corresponding bandwidth exist under the country code.
To ensure a good calibration effect, you are advised to configure at least three calibration channels.
When configuring a radio calibration set, avoid using radar channels.
In high-density scenarios, directional antennas are mostly used. It is recommended that the radio calibration function be disabled. If this function is enabled, the radio calibration effect is affected.
The DBS, big data calibration, and dual-band DCA functions are not available for the AirEngine 8760-X1-PRO, AirEngine 8760R-X1, AirEngine 8760R-X1E, AirEngine 6760-X1, AirEngine 6760-X1E, AirEngine 6760R-51, AirEngine 6760R-51E, AirEngine 5760-51, AirEngine 5760-22W, and AirEngine 5760-22WD.

Configuring Load Balancing

The load balancing function applies to scenarios where there is a high degree of overlap between APs' coverage ranges. If APs engaged in load balancing are far from each other, a STA may connect to a distant AP, which affects wireless experience of users.

When the load difference between APs reaches the load difference threshold, some STAs may access the network slowly because the APs will reject access requests of STAs according to the load balancing algorithm. If a STA continues sending association requests to an AP, the AP allows the STA to associate when the number of consecutive association attempts of the STA exceeds the maximum number of rejection times.

In static load balancing mode, APs providing the same services are manually added to a load balancing group. When a STA needs to access a WLAN, it sends an Association Request packet to an AC through an AP. The AC determines whether to permit access from the STA according to a load balancing algorithm. The implementation of static load balancing must meet the following conditions.

If dual-band APs are used, traffic is load balanced among APs working on the same frequency band.
Each load balancing group supports a maximum of 16 AP radios.

When the number of STAs is higher than 3000, the dynamic load balancing function is not recommended. If this function is enabled, AC performance is affected.

Configuring Smart Roaming

The smart roaming function applies to high-density scenarios, for example, lecture hall. This function is not recommended in scenarios where STAs move frequently. If the smart roaming function is enabled in such a scenario, it is recommended that the default roaming threshold value.

If a high roaming threshold is configured, STAs may go offline frequently. If a small roaming threshold is configured, STAs cannot roam to APs with better signals in a timely manner.

Configuring Band Steering

To allow an STA to preferentially associate with the 5 GHz radio and achieve a better access effect, configure larger power for the 5 GHz radio than the 2.4 GHz radio.
Single-radio devices do not support the band steering function.
The AP2010DN and AP6310SN-GN do not support the band steering function.

Configuring the Smart Antenna Function

Models supporting smart antennas: AirEngine 8760-X1-PRO, AirEngine 6760-X1, AirEngine 5760-51, AirEngine 5760-22W, AirEngine 5760-22WD, AP2051DN, AP2051DN-E, AP2051DN-S, R251D, R251D-E, AP4050DE-M, AP4050DE-M-S, AP4050DE-B-S, AP3050DE, AP5510-W-GP, AP7030DE, AP7050DE, and AP7052DE.
The smart antenna function cannot take effect if beamforming or MU-MIMO has been configured.

Configuring APs to Disconnect Weak-Signal STAs

This function is recommended in high-density stadium and higher education scenarios, but not recommended in wireless city scenarios.