14-WLAN Configuration Guide (AC)

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11-WLAN radio resource measurement configuration
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Configuring WLAN radio resource measurement

About WLAN radio resource measurement

WLAN radio resource measurement measures channel qualities and radio performance. It enables client and APs to learn the wireless environment and use wireless resources such as spectrum, power, and bandwidth more effectively.

WLAN radio resource measurement includes 802.11h measurement and 802.11k measurement.

802.11h measurement

802.11h measurement measures channels in the 5 GHz band. Table 1 lists the measurement types it supports.

Table 1 802.11h measurement

Type

Description

Spectrum management measurement

Basic

Measures whether a client has detected any of the following:

·     Packets from other BSSs.

·     OFDM preambles.

·     Radar signals.

·     Unknown signals.

Clear Channel Assessment (CCA)

Percentage of time that the channel was busy during the measurement period.

Receive Power Indication (RPI)

Percentage of time that each RPI was used during the measurement period.

Transmit Power Control (TPC) measurement

Measures the link redundancy and transmission power for clients.

802.11h measurement operates in the following procedure:

1.     An AP sets the Spectrum Mgmt field to 1 in beacons, probe responses, association responses, or reassociation responses to notify the clients that they can send 802.11h measurement requests.

2.     Upon receiving a measurement request from a client, the AP performs the required measurement and sends a report to the client.

The AP can also send measurement requests periodically to clients and collect measurement reports from clients.

802.11k measurement

802.11k measurement measures channels in both the 2.4 GHz and 5 GHz bands. Table 2 lists the measurement types it supports.

Table 2 802.11k measurement

Type

Description

Radio measurement

Beacon

Measures the Received Channel Power Indicator (RCPI) and Received Signal to Noise Indicator (RSNI) of beacons, measurement pilot packets, and probe responses.

Frame

Measures the number of frames transmitted and the average RCPI for these frames.

Station statistics

Measures the received and transmitted fragment counts, received and transmitted multicast frame counts, failed counts, retry counts, ACK failure counts.

Transmit stream

Measures the frame of a specific transmit stream.

Channel load

Measures the channel usage.

Location

Measures the relative locations of a requester and the requested.

Noise histogram

Measures the distribution of noise in different decibel ranges.

Link measurement

Measures RCPI, RSNI, and link redundancy for a requested link.

Neighbor measurement

Measures the channel and BSSID of neighbor APs.

802.11k measurement operates in the following procedure:

1.     An AP sets the Radio Measurement field to 1 in beacons, probe responses, association responses, or reassociation responses to notify the clients that they can send 802.11k measurement requests.

These frames also carry measurement capabilities of the AP to inform clients of measurement types that the AP supports.

The AP periodically sends Measurement Pilot frames to help clients fast discover the AP. Measurement Pilot frames are sent more frequently than beacons and carry less information.

2.     Upon receiving a measurement request from a client, the AP performs the required measurement and sends a report to the client.

The AP can also send measurement requests periodically to clients and collect measurement reports from clients.

Restrictions: Hardware compatibility with WLAN radio resource measurement

For information about MSR routers that can function as ACs, see "Compatibility of hardware and AC functionality."

Restrictions and guidelines: Radio resource measurement configuration

You can configure APs by using the following methods:

·     Configure APs one by one in AP view.

·     Assign APs to an AP group and configure the AP group in AP group view.

·     Configure all APs in global configuration view.

For an AP, the settings made in these views for the same parameter take effect in descending order of AP view, AP group view, and global configuration view.

WLAN radio resource measurement tasks at a glance

To configure WLAN radio resource measurement, perform the following tasks:

1.     Enabling radio resource management

2.     (Optional.) Setting the measurement duration and interval

3.     (Optional.) Setting the match mode for client radio resource measurement capabilities

Enabling radio resource management

1.     Enter system view.

system-view

2.     Enter AP view or an AP group's AP model view.

¡     Enter AP view.

wlan ap ap-name

¡     Execute the following commands in sequence to enter an AP group's AP model view:

wlan ap-group group-name

ap-model ap-model

3.     Enter radio view.

radio radio-id

4.     Enable a measurement type.

measure { all | link | neighbor | radio | spectrum | tpc } enable

By default:

¡     In radio view, the configuration in an AP group's radio view is used.

¡     In an AP group's radio view, measurement is disabled.

The spectrum and tpc keywords are available only for 5 GHz radios.

5.     Enable radio resource measurement.

resource-measure enable

By default:

¡     In radio view, the configuration in an AP group's radio view is used.

¡     In an AP group's radio view, radio resource measurement is disabled.

You must enable radio resource measurement if you enable link, neighbor, or radio measurement.

6.     Enable spectrum management.

spectrum-management enable

By default:

¡     In radio view, the configuration in an AP group's radio view is used.

¡     In an AP group's radio view, spectrum management is disabled.

Spectrum or TPC measurement takes effect only after you enable spectrum management.

For more information about this command, see WLAN Command Reference.

Setting the measurement duration and interval

About this task

When radio resource measurement is enabled for an AP, the AP sends measurement requests that carry the measurement duration to clients at the specified interval.

Procedure

1.     Enter system view.

system-view

2.     Enter AP view or an AP group's AP model view.

¡     Enter AP view.

wlan ap ap-name

¡     Execute the following commands in sequence to enter an AP group's AP model view:

wlan ap-group group-name

ap-model ap-model

3.     Enter radio view.

radio radio-id

4.     Set the measurement duration.

measure-duration time

By default:

¡     In radio view, the configuration in an AP group's radio view is used.

¡     In an AP group's radio view, the measurement duration is 500 TUs.

5.     Set the measurement interval.

measure-interval value

By default:

¡     In radio view, the configuration in an AP group's radio view is used.

¡     In an AP group's radio view, the measurement interval is 30 seconds.

Setting the match mode for client radio resource measurement capabilities

About this task

Set the match mode to allow a client to associate with an AP based on the predefined match criteria. Radio resource measurement capability refers to the radio resource measurement types supported by the AP and client. The device supports the following match modes for client radio resource measurement capabilities:

·     All—A client is allowed to associate with an AP only when all of its radio resource measurement capabilities match the AP's radio resource measurement capabilities.

·     None—Client radio resource measurement capabilities are not checked.

·     Partial—A client is allowed to associate with an AP as long as one of its radio resource measurement capabilities matches any of the AP's radio resource measurement capabilities.

Procedure

1.     Enter system view.

system-view

2.     Enter AP view or an AP group's AP model view.

¡     Enter AP view.

wlan ap ap-name

¡     Execute the following commands in sequence to enter an AP group's AP model view:

wlan ap-group group-name

ap-model ap-model

3.     Enter radio view.

radio radio-id

4.     Set the match mode for client radio resource measurement capabilities.

rm-capability mode { all | none | partial }

By default:

¡     In radio view, the configuration in an AP group's radio view is used.

¡     In an AP group's radio view, an AP does not check the radio resource measurement capabilities of a client.

Display and maintenance commands for WLAN radio resource measurement

Execute display commands in any view.

 

Task

Command

Display client measurement reports.

display wlan measure-report ap ap-name radio radio-id [ client mac-address mac-address ]

Radio resource measurement configuration examples

Example: Configuring radio resource measurement

Network configuration

As shown in Figure 1, configure radio resource measurement to meet the following requirements:

·     The client can come online only when all its radio resource measurement capabilities match the AP's.

·     The client can perform all types of measurements.

Figure 1 Network diagram

Procedure

# Create service template 1.

<AC> system-view

[AC] wlan service-template 1

# Set the SSID to resource-measure, and enable the service template.

[AC-wlan-st-1] ssid resource-measure

[AC-wlan-st-1] service-template enable

[AC-wlan-st-1] quit

# Create manual AP ap1, and specify the AP model and serial ID.

[AC] wlan ap ap1 model WA4320i-ACN

[AC-wlan-ap-ap1] serial-id 219801A0CNC138011454

# Enter radio view of radio 1.

[AC-wlan-ap-ap1] radio 1

# Enable spectrum management.

[AC-wlan-ap-ap1-radio-1] spectrum-management enable

# Enable radio resource measurement.

[AC-wlan-ap-ap1-radio-1] resource-measure enable

# Enable all measurement features.

[AC-wlan-ap-ap1-radio-1] measure all enable

# Set the match mode for client radio resource measurement capabilities to All.

[AC-wlan-ap-ap1-radio-1] rm-capability mode all

# Bind the service template to radio 1, and enable the radio.

[AC-wlan-ap-ap1-radio-1] service-template 1

[AC-wlan-ap-ap1-radio-1] radio enable

[AC-wlan-ap-ap1-radio-1] quit

[AC-wlan-ap-ap1] quit

Verifying the configuration

# Verify that the client has come online.

[AC] display wlan client

Total number of clients: 1

 

MAC address    Username             AP name               R IP address      VLAN

00ee-bd44-557f N/A                  ap1                   1 1.1.1.1         1

# Display measurement reports from the client.

[AC] display wlan measure-report ap ap1 radio 1

Total number of clients: 1

 

Client MAC address                              : 00ee-bd44-557f

Link measurement:

  Link margin                                   : 2 dBm

  RCPI                                          : -85 dBm

  RSNI                                          : 53 dBm

Noise histogram:

  Antenna ID                                    : 3

  ANPI                                          : -56 dBm

  IPI0 to IPI10 density                         : 5 12 16 13 8 5 5 15 17 1 3

Spectrum measurement:

  Transmit power                                : 20 dBm

  BSS                                           : Detected

  OFDM preamble                                 : Detected

  Radar                                         : Detected

  Unidentified signal                           : Undetected

  CCA busy fraction                             : 60

  RPI0 to RPI7 density                          : 3 7 11 19 15 23 15 7

Frame report entry:

  BSSID                                         : a072-2351-e253

  PHY type                                      : fhss

  Average RCPI                                  : -10 dBm

  Last RSNI                                     : 2 dBm

  Last RCPI                                     : -20 dBm

  Frames                                        : 1

Dot11BSSAverageAccessDelay group:

  Average access delay                          : 32 ms

  BestEffort average access delay               : 1 ms

  Background average access delay               : 1 ms

  Video average access delay                    : 1 ms

  Voice average access delay                    : 1 ms

  Clients                                       : 32

  Channel utilization rate                      : 11

Transmit stream:

  Traffic ID                                    : 0

  Sent MSDUs                                    : 60

  Discarded MSDUs                               : 5

  Failed MSDUs                                  : 3

  MSDUs resent multiple times                   : 3

  Lost QoS CF-Polls                             : 2

  Average queue delay                           : 2 ms

  Average transmit delay                        : 1 ms

  Bin0 range                                    : 0 to 10 ms

  Bin0 to Bin5                                  : 5 10 10 5 10 10