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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).
Configuring Radio Calibration

Configuring Radio Calibration

Context

The radio calibration function can dynamically adjust channels and transmit power of APs to ensure that the APs work at the optimal performance.

There are three radio calibration modes:
  • Auto mode: The device periodically implements global radio calibration at regular intervals (the interval is specified by interval and the default interval is 1440 minutes, and the start time for radio calibration is 03:00:00).
    NOTE:

    In auto mode, the device continuously detects neighbors and updates neighbor information. When a radio calibration interval is reached, global radio calibration is triggered. The auto mode applies to coverage hole compensation, coverage hole compensation reversal, and partial radio calibration.

  • Manual mode: The device does not proactively perform radio calibration. You need to run the calibrate manual startup command to trigger global calibration.
  • Schedule mode: The device triggers global radio calibration at a time specified by the parameter time.
The three modes cannot be configured simultaneously. You can choose any of the modes as required. Schedule mode is recommended, which can be specified using the calibrate enable schedule time time-value command. You can configure the device to perform radio calibration in off-peak hours, for example, between 00:00 am and 06:00 am.
Before radio calibration, you can adjust radio calibration parameters based on the wireless environment to achieve the optimal calibration effect.
  • Enable DFS smart selection by running the The switched-to channel is a random non-radar channel and therefore may be the same as or close to the channel of surrounding 5 GHz radios, leading to severe interference and poor user experience. The DFS smart selection function is enabled by default to adjust the 5 GHz channel of an AP to one with the least interference. command.
  • Configure the noise floor threshold for triggering radio calibration by running the The noise floor threshold for triggering radio calibration can be used to determine whether the environment noise is normal. When detecting a noise floor value higher than the threshold, an AP reports a high noise floor message to the AC. The AC then performs radio calibration to avoid channels with high noise floor values to improve user experience. command. When configuring the radio calibration policy, select noise-floor. Otherwise, the function cannot take effect.
  • Configure the Transmit Power Control (TPC) coverage threshold by running the When radio calibration is enabled, the TPC coverage threshold is different depending on AP deployment scenarios because the AP deployment distance or height differs. To ensure the optimal coverage effect, adjust the TPC coverage threshold based on the actual AP deployment situations. A large threshold indicates a wider transmit power range that can be adjusted through TPC. command.
  • Configure the maximum and minimum power values for radio calibration.

    After radio calibration is enabled, an AP uses the Transmit Power Control (TPC) algorithm to calculates the transmit power to be adjusted based on detected neighbor information. If the transmit power to be adjusted calculated using the TPC algorithm is to large, signal interference between APs may occur. If the transmit power calculated using the TPC algorithm is too small, radio coverage requirements may not be met.

    You can adjust the maximum and minimum calibration powers using the calibrate max-tx-power and calibrate min-tx-power commands. The valid power after radio calibration is between the two values. If the values are set improperly, the maximum and minimum calibration power settings may fail to take effect.
    • If the maximum calibration power is smaller than the minimum transmit power of an AP, the minimum transmit power takes effect. For example, if the minimum transmit power of an AP on the 2.4 GHz band is 9 dBm and the maximum calibration power is set to 8 dBm, the transmit power on the 2.4 GHz band is 9 dBm after radio calibration.
    • If the minimum calibration power is smaller than the maximum transmit power of an AP, the maximum transmit power takes effect. For example, if the maximum transmit power on the 2.4 GHz band is 21 dBm and the minimum calibration power is set to 25 dBm, the transmit power on the 2.4 GHz band is 21 dBm after radio calibration.
  • Configure the bit error rate (BER) threshold. If the MAC layer of a radio does not receive any ACK packet after sending a packet at the lowest rate, it considers that an error occurs. The BER threshold determines whether the radio environment is normal. When the BER of a radio reaches the threshold, the system considers that the radio environment deteriorates. When this occurs, the system may start radio calibration or take measures to avoid signal interference.

Pre-configuration Tasks

Before configuring radio calibration, perform the task of WLAN Service Configuration Guide (Common AP).

Configuration Notes

  • Global radio calibration is implemented on all APs.

  • Radio calibration does not take effect on radios enabled with WDS or Mesh functions.

  • Radio calibration is not applicable to scenarios where APs cannot detect each other, for example, APs use directional antennas, are far from each other, or have obstacles between them.

  • Radio calibration is not applicable to high-density, WDS/Mesh backhaul, rail transportation, or external directional-antenna scenarios.

  • Radios in monitoring mode do not participate in calibration.
  • Some functions are dependent on channel scanning, for example, radio calibration, smart roaming, and WIDS. After such a function is configured, a channel switchover during the scanning increases the users service data delay, which may affect wireless service experience.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Configure automatic channel selection and automatic transmit power selection for APs.
    1. Run the interface wlan-radio wlan-radio-number command to enter the radio interface view.
    2. Run the undo calibrate auto-channel-select disable command to enable automatic channel selection.

      By default, automatic channel selection is enabled.

    3. Run the undo calibrate auto-txpower-select disable command to enable automatic transmit power selection.

      By default, automatic transmit power selection is enabled.

  3. Run the quit command to return to the system view.
  4. Run the wlan command to enter the WLAN view.
  5. Configure the DFS smart selection, noise floor threshold, Transmit Power Control (TPC) for APs.
    1. Run the rrm-profile name profile-name command to enter the RRM profile view.
    2. (Optional) Run the dfs smart-selection disable command to disable the DFS smart selection function.

      By default, the DFS smart selection function is enabled.

    3. (Optional) Run the dfs recover-delay delay-time command to set the delay in switching back the DFS channel.

      By default, the delay in switching back the DFS channel is 0 minutes. That is, the channel is switched back to the manually planned channel when the legitimate aging time (30 minutes) expires.

    4. (Optional) Run the calibrate noise-floor-threshold threshold command to specify the noise floor threshold for triggering radio calibration.

      The default noise floor threshold for triggering radio calibration is -75 dBm.

    5. (Optional) Run the calibrate tpc threshold threshold command to configure the TPC coverage threshold.

      The default TPC coverage threshold is –60 dBm.

    6. (Optional) Run the calibrate max-tx-power power command to set the maximum transmit power that can be adjusted through radio calibration.

      By default, the maximum transmit power that can be adjusted through radio calibration is 127 dBm.

    7. (Optional) Run the calibrate min-tx-power power command to set the minimum transmit power that can be adjusted through radio calibration.

      By default, the minimum transmit power that can be adjusted through radio calibration is 9 dBm.

    8. (Optional) Run the calibrate error-rate-threshold error-rate-threshold command to set the bit error rate (BER) threshold.

      By default, the BER threshold is 60%.

    9. (Optional) Run the calibrate error-rate-check interval interval traffic-threshold traffic-threshold command to set the interval and traffic threshold for checking the bit error rate (BER).

      The default interval and traffic threshold for checking the BER are 1 minute and 1250 kbit/s, respectively.

    10. Run the quit command to return to the WLAN view.
    11. Run the radio-2g-profile name profile-name or radio-5g-profile name profile-name command to enter the 2G or 5G radio profile view.
    12. Run the rrm-profile profile-name command to bind the RRM profile to the 2G or 5G radio profile.
    13. Run the quit command to return to the WLAN view.
  6. Run:

    calibrate enable { auto [ interval interval-value [ start-time start-time ] ] | manual | schedule time time-value }

    The radio calibration mode is configured.

    By default, the radio calibration mode is auto, the radio calibration interval is 1440 minutes, and the start time for radio calibration is 03:00:00.

  7. (Optional) Run:

    calibrate policy { rogue-ap | load | noise-floor }

    The radio calibration policy is created.

    By default, no radio calibration policy is created. Radio calibration policies can be used together. You can run the command multiple times to configure different radio calibration policies according to service requirements.
    NOTE:
    If the noise floor threshold for radio calibration is configured in the RRM profile, select noise-floor in the radio calibration policy. Otherwise, the function cannot take effect.
    Radio calibration policies are classified into:
    NOTE:

    The rogue AP and noise floor policies take effect only in automatic radio calibration mode.

    • Rogue AP policy: When rogue APs exist on a network, set the radio calibration policy to rogue-ap. The device then immediately takes actions to avoid interference. This policy may lead to frequency channel switchovers. You are advised to use this policy under the instruction of technical support personnel.
    • Load policy: When this radio calibration policy is used, the AP traffic load difference is considered for channel allocation. The device allocates channels with less interference to APs with heavier loads. The AP load changes with times. You are advised to use this policy under the instruction of technical support personnel.
    • Noise floor policy: When the noise floor of APs is high due to special external interference, service experience may deteriorate. With this radio calibration policy, the device takes actions to avoid interference. When detecting that the noise floor of the current channel exceeds the threshold for three consecutive times, the AP switches its channel and does not switch back in 30 minutes.

  8. (Optional) Run:

    calibrate sensitivity { low | medium | high }

    The radio calibration sensitivity is set for the device.

    By default, the radio calibration sensitivity of the device is medium.

  9. (Optional) Configure the calibration bandwidth and calibration channel set.
    1. Run the dca-channel 5g bandwidth { 20mhz | 40mhz | 80mhz } command to configure the calibration bandwidth.

      By default, the global calibration bandwidth is 20 MHz. This command takes effect only on the 5 GHz frequency band.

    2. Run the dca-channel { 2.4g | 5g } channel-set channel-value command to configure a calibration channel set.

      By default, a calibration channel set contains channels 1, 6, and 11 on the 2.4G radio and contains all channels supported by the corresponding country code on the 5G radio. If the country code is China, the calibration channel set does not contain channels 36 to 64. When configuring the calibration channels, users can specify channels as prompted.

      NOTE:

      When configuring a calibration channel set, avoid using radar channels.

      The channels you configure must be supported by the terminals; otherwise, the terminals cannot discover wireless signals. For example, when the country code is set to China, 5 GHz channels 36, 40, 44, 48, 52, 56, 60, and 64 can be configured. However, most terminals do not support these channels currently. If these channels are configured, the terminals cannot discover wireless signals. In this case, you can configure 5 GHz channels 149, 153, 157, 161, and 165, which are supported by the terminals.

      Only the AP1050DN-S, AP2050DN, AP2050DN-E, AP8050DN, AP8050DN-S, AP8150DN, AP4050DN, AP4050DN-S, AP4051DN, AP4151DN, AP4030DN, AP4050DN-E, AP4050DN-HD, AP4130DN, AP5030DN, AP4030TN, AP6050DN, AP6150DN, AP5130DN, AP7050DN-E, AP7050DE, AP8030DN, AP8130DN, AP9131DN, AP9132DN, and AP9130DN support 80 MHz calibration bandwidth.

      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.

      To prevent signal interference, ensure that adjacent APs work in non-overlapping channels. The 2.4 GHz frequency band has overlapping channels. When configuring calibration channels, you are advised to configure a non-overlapping calibration channel set containing channels 1, 6, and 11 or containing channels 1, 5, 9, and 13.

  10. Configure the air scan function for radio calibration.

    The configured air scan profile applies to the radio calibration, smart roaming, and WIDS functions.

    1. Run the air-scan-profile name profile-name command to create an air scan profile and enter the air scan profile view.
    2. Run the undo scan-disable command to enable the air scan function.

      By default, the air scan function is enabled.

    3. Run the scan-channel-set { country-channel | dca-channel | work-channel } command to configure an air scan channel set.

      By default, an air scan channel set contains all channels supported by the corresponding country code of an AP.

      If the radio working mode is set to monitor, the AP scans all channels supported by the country code.

    4. Run the scan-interval scan-time command to set the air scan interval.

      By default, the air scan interval is 60000 ms.

    5. Run the scan-period scan-time command to set the air scan period.

      By default, the air scan period is 60 ms.

    6. Run the quit command to return to the WLAN view.
    7. Run the radio-2g-profile name profile-name or radio-5g-profile name profile-name command to enter the 2G or 5G radio profile view.
    8. Run the air-scan-profile profile-name command to bind the air scan profile to the 2G or 5G radio profile.
    9. Run the quit command to return to the WLAN view.

Verifying the Configuration

  • Run the display wlan calibrate channel-set command to check the calibration channel and bandwidth that take effect.
  • Run the display air-scan-profile name profile-name command to check the air scan profile configuration.
  • Run the display radio-2g-profile name profile-name command to check the RRM profile and air scan profile bound to a 2G radio profile.
  • Run the display radio-5g-profile name profile-name command to check the RRM profile and air scan profile bound to a 5G radio profile.

Follow-up Procedure

In any mode, you can run the calibrate manual startup command to trigger the calibration. In manual mode, the device implements radio calibration only after the calibrate manual startup command is executed.

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Updated: 2019-01-11

Document ID: EDOC1000176006

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