Radio Interface
After a collision detection, a backoff wait time is calculated. The total wait time is the sum of a minimum wait time (Arbitration Inter‐Frame Space, or AIFS) determined from the AIFSN, and a random backoff time calculated from a value selected from zero to the CW. The CW value varies within a configurable range. It starts at CWMin and doubles after every collision up to a maximum value, CWMax. After a successful transmission, the CW value is reset to its CWMin value.
Figure 4-1 WMM Backoff Wait times
High Priority
Low Priority
|
| Time |
CWMin |
| CWMax |
AIFS | Random Backoff |
|
Minimum Wait Time | Random Wait Time |
|
| CWMin | CWMax |
AIFS |
| Random Backoff |
Minimum Wait Time | Random Wait Time | |
For high‐priority traffic, the AIFSN and CW values are smaller. The smaller values equate to less backoff and wait time, and therefore more transmit opportunities.
Using Web Management to Configure WMM
To configure WMM, select Radio Settings under the type of interface (802.11a or 802.11b/g) that you want to configure, and scroll down to the WMM configuration settings.
•WMM sets the WMM operational mode on the access point. When enabled, the parameters for each AC queue will be employed on the access point and QoS capabilities are advertised to WMM‐enabled clients. Default: Support
– Disable: WMM is disabled.
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