cca-threshold
Function
The cca-threshold command sets the clear channel assessment (CCA) threshold for APs.
The undo cca-threshold command restores the default CCA threshold of APs.
By default, no CCA threshold is specified. APs use the default CCA threshold of the chip.
This command takes effect only on the AirEngine 9700D-M (including the mapping RUs), AirEngine 8760-X1-PRO, AirEngine 8760R-X1, AirEngine 8760R-X1E, AirEngine 6760-X1, AirEngine 6760-X1E, AirEngine 6760R-51, AirEngine 6760R-51E, AirEngine 5760-51, AirEngine 5760-22W, AD9430DN-12 (including matching RUs), AD9430DN-24 (including matching RUs), AD9431DN-24X (including matching RUs), AP1050DN-S, AP2030DN, AP2030DN-S, AP2050DN, AP2050DN-E, AP2050DN-S, AP2051DN, AP2051DN-E, AP2051DN-S, AP3030DN, AP4030DN, AP4030DN-E, AP4030TN, AP4050DN, AP4050DN-E, AP4050DN-HD, AP4050DN-S, AP4051DN, AP4051DN-S, AP4051TN, AP4130DN, AP4151DN, AP430-E, AP5030DN, AP5030DN-S, AP5050DN-S, AP5130DN, AP6050DN, AP6052DN, AP6150DN, AP7050DE, AP7050DN-E, AP7052DE, AP7052DN, AP7152DN, AP8030DN, AP8050DN, AP8050DN-S, AP8050TN-HD, AP8082DN, AP8130DN, AP8130DN-W, AP8150DN, AP8182DN, AP4050DE-M, AP4050DE-M-S, AP4050DE-B-S, AP3050DE, AP7060DN, AP2051DN-L-S, WA375DD-CE, AP5510-W-GP, AirEngine 5760-10, AP9131DN, AP9132DN, and AP9330DN.
Parameters
| Parameter | Description | Value |
|---|---|---|
| cca-threshold | Specifies the CCA threshold for APs. |
The value is an integer that ranges from -85 to -40, in dBm. |
Usage Guidelines
The CCA mechanism enables a WLAN chip to determine whether the channel is idle before transmitting signals to the air interface. If so, the chip transmits signals. If not, the chip waits until the channel is idle.
The CCA threshold is used by a WLAN chip to determine whether the channel is idle. If the noise on the channel exceeds the threshold, the chip considers the channel busy. Otherwise, the chip considers the channel idle.
When deploying a WLAN, set a proper CCA threshold to reduce signal interference and improve the channel reuse rate.
- If APs densely are deployed, a high CCA threshold is recommended to narrow down the coverage and skip remote weak signals.
- If APs are sparsely deployed, a low CCA threshold is recommended to maximize the effective coverage of signals.
Example
# Set the CCA threshold for a 2G radio to -70 dBm.
<HUAWEI> system-view [HUAWEI] wlan [HUAWEI-wlan-view] radio-2g-profile name default [HUAWEI-wlan-radio-2g-prof-default] cca-threshold -70 Warning: This parameter may affect uplink access coverage or STA access. Modify this parameter only under the guidance of technical personnel. Continue? [Y/N]Y