Huawei quidway s7700 Configuration Manual page 172

Quidway S7700 Smart Routing Switch
Configuration Guide - SPU
Step 4 (Optional) Run:
wmm edca client { ac-vo | ac-vi | ac-be | ac-bk } { aifsn aifsn-value | ecw ecwmin
ecwmin-value ecwmax ecwmax-value | txoplimit txoplimit-value }
The EDCA parameters are configured for the four WMM queues of a STA.
Step 5 (Optional) Run:
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 } }
The EDCA parameters are configured for the four WMM queues of an AP.
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Configuring a Radio Profile
You can configure the radio type, radio rate, radio power mode, and channel mode in a radio
profile and bind a Wi-Fi multimedia (WMM) profile to the radio profile. A radio profile can be
applied to a radio only after a WMM profile is bound to the radio profile.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
wlan
The WLAN view is displayed.
Issue 01 (2011-07-15)
NOTE
A STA communicates with an AP by sending radio packets over a channel. Four queues are provided for
radio packets. Packets in different queues have different opportunities to obtain transmission channels so
that differentiated services can be provided for radio packets.
The queues are AC_VO (voice queue), AC_VI (video queue), AC_BE (best effort queue), and AC_BK
(background queue) in descending order of priorities.
You can change the priority order of the queues by modifying the Enhanced Distributed Channel Access
(EDCA) parameters, including the arbitration inter frame spacing number (AIFSN), exponent form of
minimum contention window (ECWmin), exponent form of maximum contention window (ECWmax),
transmission opportunity limit (TXOPlimit), and ACK policy.
l AIFSN: determines the channel idle time. A greater AIFSN value indicates a longer channel idle
duration. Different AIFSNs can be configured for ACs.
l ECWmin and ECWmax: determine the average backoff time. A larger value indicates a longer average
backoff time.
l TXOPLimit: determines the maximum duration in which a STA can occupy a channel. A larger value
indicates a longer duration. If this parameter is set to 0, a STA can send only one packet every time it
occupies a channel.
l ACK policy: determines whether the packet receiver acknowledges received packets. Two policies are
available: normal ACK and no ACK.
Before occupying a channel to send packets, STAs monitor the channel. If the channel idle time is longer
than or equal to the AIFSN, each STA selects a random backoff time between ECWmin and ECWmax.
The STA whose backoff timer expires the first occupies the channel and starts to send packets over the
channel.
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5 WLAN Configuration
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