wmm edca-ap

Function

The wmm edca-ap command sets EDCA parameters and ACK policies for an AP.

The undo wmm edca-ap command restores the default EDCA parameters and ACK policies for an AP.

Table 1 lists the default EDCA parameter settings and ACK policies for APs.

**Table 1** Default EDCA parameter settings and ACK policies for APs
Packet Type	ECWmax	ECWmin	AIFSN	TXOPLimit	ACK Policy
AC_VO	3	2	1	47	normal
AC_VI	4	3	1	94	normal
AC_BE	6	4	3	0	normal
AC_BK	10	4	7	0	normal

Format

wmm edca-ap { ac-vo | ac-vi | ac-be | ac-bk } { aifsn aifsn-value | ecw ecwmin ecwmin-value ecwmax ecwmax-value | txoplimit txoplimit-value | ack-policy { normal | noack } } ^*

undo wmm edca-ap

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 AIFSN, which determines the channel idle time.	The value is an integer that ranges from 1 to 15.
ecwmin ecwmin-value	Specifies the ecwmin-value. ecwmin-value and ecwmax-value determine the average backoff time.	The value is an integer that ranges from 0 to 15 and must be less than or equal to the ecwmax-value value.
ecwmax ecwmax-value	Specifies the ecwmax-value. ecwmax-value and ecwmin-value determine the average backoff time.	The value is an integer that ranges from 0 to 15 and must be greater than or equal to the ecwmin-value value.
txoplimit txoplimit-value	Specifies the TXOPLimit, which determines the maximum duration in which an AP or a STA can occupy a channel. A larger txoplimit-value 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 value is 0, the STA can send only one data frame every time it occupies a channel.
ack-policy { normal \| noack }	Specifies an ACK policy. normal: During 802.11 packet exchange, the receiver must return an ACK packet each time it receives a packet from the sender. noack: The receiver does not need to send an ACK message when it receives a packet from the sender. Configure this parameter only in the good air interface environment. Otherwise, severe packet loss occurs.	-

Views

2G radio profile view, 5G radio 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 different priorities to the packets. In this way, APs have different capabilities to compete for channels and provide differentiated services.

Precautions

The EDCA parameters configured for the four AC queues take effect only after the WMM function is enabled. By default, the WMM function is enabled in a 2G or 5G radio profile.
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.

EDCA parameters must be configured properly. The scenarios for the reference EDCA parameter settings and ACK policies are as follows:

Table 2 lists the reference EDCA parameter settings and ACK policies for APs in voice scenarios.

**Table 2** Reference EDCA parameter settings and ACK policies for APs in voice scenarios
Packet Type	ECWmax	ECWmin	AIFSN	ACK Policy
AC_VO	4	2	2	normal
AC_VI	5	3	5	normal
AC_BE	10	6	5	normal
AC_BK	10	8	12	normal

Table 3 lists the reference EDCA parameter settings and ACK policies for APs in voice and video scenarios.

**Table 3** Reference EDCA parameter settings and ACK policies for APs in voice and video scenarios
Packet Type	ECWmax	ECWmin	AIFSN	ACK Policy
AC_VO	4	2	2	normal
AC_VI	5	3	5	normal
AC_BE	10	6	12	normal
AC_BK	10	8	12	normal

In high-density scenarios, it is recommended that you run the dynamic-edca enable command to enable dynamic EDCA parameter adjustment.
For other scenarios, the default settings are recommended.

Example

# Set EDCA parameters and ACK policies for AC_VO packets in 5G radio profile default.

<HUAWEI> system-view
[HUAWEI] wlan
[HUAWEI-wlan-view] radio-5g-profile name default
[HUAWEI-wlan-radio-5g-prof-default] wmm edca-ap ac-vo aifsn 7 ecw ecwmin 4 ecwmax 10 txoplimit 0 ack-policy normal