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S12700 V200R013C00 Command Reference

This document describes all the configuration commands of the device, including the command function, syntax, parameters, views, default level, usage guidelines, examples, and related commands.
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fwa wmm edca-client

fwa wmm edca-client

Function

The fwa wmm edca-client command configures EDCA parameters used by the remote AP to negotiate with the AT.

The undo fwa wmm edca-client command restores the default EDCA parameters used by the remote AP to negotiate with the AT.

Table 11-228 lists the default EDCA parameter settings.
Table 11-228  Default EDCA parameter settings
Packet Type Parameters Description
AC_VO ECWmax 3
ECWmin 2
AIFSN 2
TXOPLimit 47
AC_VI ECWmax 4
ECWmin 3
AIFSN 2
TXOPLimit 94
AC_BE ECWmax 10
ECWmin 4
AIFSN 3
TXOPLimit 0
AC_BK ECWmax 10
ECWmin 4
AIFSN 7
TXOPLimit 0

Format

fwa wmm edca-client { ac-vo | ac-vi | ac-be | ac-bk } { aifsn aifsn-value | ecw ecwmin ecwmin-value ecwmax ecwmax-value | txoplimit txoplimit-value } *

undo fwa wmm edca-client

Parameters

Parameter

Description

Value

ac-vo

Indicates AC_VO packets.

-

ac-vi

Indicates AC_VI packets.

-

ac-be

Indicates AC_BE packets.

-

ac-bk

Indicates AC_BK packets.

-

aifsn aifsn-value

Specifies the arbitration inter frame spacing number (AIFSN), which determines the channel idle time.

The value is an integer that ranges from 1 to 15.

ecwmin ecwmin-value

Specifies the exponent form of the minimum contention window. ecwmin-value and ecwmax-value determine the average backoff time.

The value is an integer that ranges from 0 to 15 and must be smaller than the ecwmax-value value.

ecwmax ecwmax-value

Specifies the exponent form of the maximum contention window. ecwmin-value and ecwmax-value determine the average backoff time.

The value is an integer that ranges from 0 to 15 and must be greater than the ecwmin-value value.

txoplimit txoplimit-value

Specifies the transmission opportunity limit (TXOPLimit), which determines the maximum duration in which a STA can occupy a channel. A larger TXOPLimit value indicates a longer duration to occupy a channel.

The value is an integer that ranges from 0 to 255. The unit is 32 microseconds.
NOTE:

If the TXOPLimit value is 0, the STA can send only one data frame every time it occupies a channel.

Views

Mesh profile view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

WMM classifies data packets into the following access categories (ACs): AC_VO, AC_VI, AC_BE, and AC_BK. A set of EDCA parameters is set for each AC queue. These parameters determine the capabilities of a queue to occupy a channel. You can set EDCA parameters for packets of different ACs to provide differentiated priorities to the packets and different capabilities to compete for channels. In this way, differentiated services are implemented.

Table 11-229 describes the EDCA parameters.
Table 11-229  EDCA parameter description

Parameter

Meaning

Arbitration Interframe Spacing Number (AIFSN)

The DIFS has a fixed value. WMM provides different DIFS values for different ACs. A large AIFSN value means that the STA must wait for a long time and has a low priority.

Exponent form of CWmin (ECWmin) and exponent form of CWmax (ECWmax)

ECWmin specifies the minimum backoff time, and ECWmax specifies the maximum backoff time. Together, they determine the average backoff time. Large ECWmin and ECWmax values mean a long average backoff time for the STA and a low STA priority.

Transmission Opportunity Limit (TXOPLimit)

After preempting a channel, the STA can occupy the channel within the period of TXOPLimit. A large TXOPLimit value means that the STA can occupy the channel for a long time. If the TXOPLimit value is 0, the STA can only send one data frame every time it preempts a channel.

Precautions

  • The EDCA parameters configured using the fwa wmm edca-client command take effect only after you set the EDCA mode to manual mode using the fwa wmm edca-mode manual command.
  • By default, queues of AC_VO, AC_VI, AC_BE, and AC_BK are in descending order of priority. Priorities of the four queues are determined by their EDCA parameters.
You need to configure EDCA parameters according to actual scenarios. Table 11-230 shows the configuration of EDCA parameters in voice scenarios, and Table 11-231 shows the configuration in voice and video hybrid scenarios.
Table 11-230  Recommended configuration of EDCA parameters in voice scenarios
Packet Type Parameters Description
AC_VO ECWmax 4
ECWmin 2
AIFSN 2
TXOPLimit 0
AC_VI ECWmax 5
ECWmin 3
AIFSN 5
TXOPLimit 0
AC_BE ECWmax 10
ECWmin 6
AIFSN 5
TXOPLimit 0
AC_BK ECWmax 10
ECWmin 8
AIFSN 12
TXOPLimit 0
Table 11-231  Recommended configuration of EDCA parameters in voice and video hybrid scenarios
Packet Type Parameters Description
AC_VO ECWmax 4
ECWmin 2
AIFSN 2
TXOPLimit 0
AC_VI ECWmax 5
ECWmin 3
AIFSN 5
TXOPLimit 0
AC_BE ECWmax 10
ECWmin 6
AIFSN 12
TXOPLimit 0
AC_BK ECWmax 10
ECWmin 8
AIFSN 12
TXOPLimit 0

Example

# Configure EDCA parameters of AC_VO packets used by the remote AP to negotiate with the AT.

<HUAWEI> system-view
[HUAWEI] wlan
[HUAWEI-wlan-view] mesh-profile name test
[HUAWEI-wlan-mesh-prof-test] fwa wmm edca-mode manual
[HUAWEI-wlan-mesh-prof-test] fwa wmm edca-client ac-vo aifsn 7 ecw ecwmin 4 ecwmax 10 txoplimit 0
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Updated: 2019-04-09

Document ID: EDOC1100065659

Views: 115647

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