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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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Configuring Train-Ground Communication (For Vehicle-Mounted APs in V200R007 or Later)

Configuring Train-Ground Communication (For Vehicle-Mounted APs in V200R007 or Later)

Context

Train-ground communication involves Mesh handover and client scenarios.

Mesh handover scenario: Deploy trackside APs along the railway line, which set up Mesh links with vehicle-mounted APs using the same channel. The vehicle-mounted APs on a moving train can perform link handovers, without the need to scan channels.

Mesh client scenario: Deploy trackside APs by segment (for example, only in stations) instead of along the railway line. To meet throughput or coverage efficiency requirements, you need to configure trackside APs to work in different channels. Vehicle-mounted APs scan channels of neighboring APs to perform Mesh link handovers.

NOTE:

Perform either of the following operations based on train-ground communication scenarios.

Procedure

  • Configure the Mesh handover mode.
    1. Run system-view

      The system view is displayed.

    2. Run wlan

      The WLAN view is displayed.

    3. Run mesh-handover-profile name profile-name

      A Mesh handover profile is created, and the Mesh handover profile view is displayed.

      By default, the system provides the Mesh handover profile default.

    4. Run location-based-algorithm enable [ moving-direction { backward | forward | undetermined } ]

      The location-based enhanced fast link handover algorithm is enabled, and the moving direction of the vehicle-mounted AP is configured.

      By default, the location-based enhanced fast link handover algorithm is disabled and the moving direction of the vehicle-mounted AP is undetermined.

      NOTE:

      After the location-based enhanced link handover algorithm is enabled, the vehicle-mounted AP will switch the active link to the nearest trackside AP that meets handover requirements.

      In vehicle-ground communication scenarios, signals of a trackside AP distant from a train may be temporarily better than the trackside AP near the train due to radio environment changes. If an active link handover occurs at this time, the active link may be incorrectly switched to the distant trackside AP. To prevent incorrect handovers and improve vehicle-ground communication quality, you can use the location-based enhanced link handover algorithm. This algorithm requires that trackside APs be named in ascending or descending order of sequence numbers.

      Trackside APs should be named in head-name_sequence-number format. head-name describes track line information and can be different for trackside APs on the same track. It is recommended that you set the same head-name for APs on a track to differentiate tracks. sequence-number of APs along a track must be in descending or ascending order. The sequence numbers of trackside APs can be set with unequal steps. head-name and sequence-number are separated using an underline (_), for example, L1_001, L1_002, L1_005, L1_010.

    5. Run max-rssi-threshold value

      The maximum RSSI threshold of a Mesh link is specified.

      By default, the maximum RSSI threshold of a Mesh link is -20 dBm in a Mesh handover profile.

    6. Run min-rssi-threshold value

      The minimum RSSI threshold of a Mesh link is specified.

      By default, the minimum RSSI threshold of a Mesh link is -60 dBm in a Mesh handover profile.

    7. Run link-hold-period value

      The holding time of a Mesh link is specified.

      By default, the holding time of a Mesh link is 4,000 ms.

    8. Run rssi-margin value

      The RSSI threshold for a Mesh link handover is specified.

      By default, the RSSI threshold for a Mesh link handover is 10 dB.

    9. Run link-probe-interval value

      The Mesh link probe interval is specified.

      By default, the Mesh link probe interval is 100 ms in a Mesh handover profile.

    10. Run p-n criteria observe-time observe-value qualify-time qualify-value

      The P/N criterion for a handover is specified.

      By default, the observing value in the P/N criterion is three detection times and the qualified value is two detection times.

    11. Run urgent-handover low-rate threshold rate-value period time

      The minimum rate threshold for an emergency handover and the minimum rate holding time are specified.

      By default, the minimum rate threshold for an emergency handover is 10 Mbit/s and the minimum rate holding time is 2,000 ms.

    12. Run urgent-handover punishment period time rssi value

      The penalty parameters for an emergency handover are configured.

      By default, the penalty period for an emergency handover is 2,000 ms and the penalty level is 10 dB.

    13. Run quit

      Return to the WLAN view.

    14. Run mesh-profile name profile-name

      A Mesh profile is created, and the Mesh profile view is displayed.

      By default, the system provides the Mesh profile default.

    15. Run mesh-handover-profile profile-name

      A Mesh handover profile is bound to the Mesh profile.

      By default, no Mesh handover profile is bound to a Mesh profile.

  • Configure the Mesh client mode.
    1. Run system-view

      The system view is displayed.

    2. Run wlan

      The WLAN view is displayed.

    3. Run mesh-profile name profile-name

      A Mesh profile is created, and the Mesh profile view is displayed.

      By default, the system provides the Mesh profile default.

    4. Run client-mode enable

      The Mesh client mode is enabled.

      By default, the Mesh client mode is disabled.

    5. Run quit

      Return to the WLAN view.

    6. Run air-scan-profile name profile-name

      An air scan profile is created, and the air scan profile is displayed.

    7. (Optional) Run scan-channel-set { country-channel | dca-channel | work-channel }

      An air scan channel is configured.

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

    8. (Optional) Run scan-period scan-time

      The air scan period is configured.

      The default air scan period is 60 ms.

      NOTE:

      A longer air scan period indicates more collected data and a more accurate data analysis result. However, if the air scan period is set too large, WLAN services are affected. You are advised to use the default value.

    9. (Optional) Run scan-interval scan-time

      The air scan interval is configured.

      By default, the air scan interval is 10000 ms.

      NOTE:
      • The air scan interval ranges from 300 ms to 1000 ms.

      • The air scan interval also applies to radio calibration, smart roaming, WLAN location, and WIDS functions.

      • If the customer has high requirements on real-time data analysis, configure a small air scan interval using the scan-interval command to improve the scan frequency; however, higher scan frequency indicates much larger impact on the services.

    10. Run quit

      Return to the WLAN view.

    11. Run radio-2g-profile name default or radio-5g-profile name default

      The 2G or 5G radio profile view is displayed.

    12. Run air-scan-profile profile-name

      The air scan profile is bound to the radio profile.

      By default, the air scan profile default is bound to a radio profile.

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Updated: 2018-12-24

Document ID: EDOC1100038361

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