enable the CCA in wilink8

Albin,

CCA is on by default as part of 802.11 MAC/PHY. What are you trying to achieve?

Iain

Hi Iain, 

Customer is doing below ETSI testing. and got failing. 

do you think WiFi should be applied for this clause or CCA could help?

4.3.2.6 Adaptivity (adaptive equipment using modulations other than FHSS)
4.3.2.6.1 Applicability
This requirement does not apply to non-adaptive equipment or adaptive equipment operating in a non-adaptive mode
providing the equipment complies with the requirements and/or restrictions applicable to non-adaptive equipment.

BR. Albin

Dear Albin,
Dear Albin,

Nice to meet you, I'm Ryosuke Goto from customer.
I have two questions to check with additional about CCA.
I hope for your follow-up.

1.About "Core.rx.rx_cca_threshold"
We printed a dump file of the binary_name file into a text file:
The test file is "wl18xx-conf.txt".

Core.rx.rx_cca_threshold = 0x0000

There was a setting parameter of a label name likely to be related to CCA.
-What kind of function parameter is this parameter (core.rx.rx_cca_threshold)?
-Would you tell us the range of setting values, contents of setting value, how to set it?
and
Please confirm that it is related to "ETSI EN 300 328 V 1.9.1 4.3.2.6 Test's Fail".

2.About "Override CCA"
I confirmed the following in TI's WiKi page.
processors.wiki.ti.com/.../WL18xx_TX_Testing
It is described in "TX Continuous Test" of
<Options 2> Supported options according to bitmap:
Bit 1: Override CCA (FW 8.9.0.0.2: 0-Don't override, 1-Override)
Bit 2: Fixed / Incremental Sequence Number (FW 8.9.0.0.20: 0 - Incremental, 1 - Fixed)
-What kind of function setting is "Override CCA"?
-If it is set to "1-Overraide", what kind of behavior does the module do?

3.
It is written in ER4O0971B_R01_EN300328_Texas_WG7837-T0B_WLAN_only.pdf
I will question about 4.3.2.5 of Ver.1.8.1.
When performing 4.3.2.5, please tell me the test mode operation procedure on the WL18xx module side.
Please tell us which driver version you used.

Hi ALbin,

The settings required for the EN300328 and 301893 are found in the annexe E and F documents linked to from 

These give the declarations to the test house which drive which tests to run.

Iain

Hi Albin,

The ETSI tests require the device to be declared as a load based device. This implicitly includes CCA and so disabling CCA is not the solution to the problem.

p) Adaptivity (Channel Access Mechanism): Load Based Equipment Option A
Specify which protocol has been implemented: IEEE 802.11
CCA observation time NA
q) The CCA time implemented by the equipment: 9µs

 

Hopefully someone else can give the test commands used as this is not something I know.

Iain

Hi,Lain and Albin
the costom is doing CE certification now , so it is very urgent .
Please try to find the solution as soon as possible .

Dear Lain and Albin

We have not passed "4.3.2.6 Adaptivity Test" on ETSI testing yet.

In order to verify that Energy Detect is working correctly,

we injected the transmit power of the transmitter against the wl1837 module.

I will attach a log by using WL glogger.

Please find the attached log.

We acquired the log from the injection of jamming waves until the Tx Stop due to jamming waves on wl1837 module.

JammingTest_glogger_2016_11_30.zip

Can you see that the Energy Detect function is working on this log?

I want to know whether Energy Detection is working properly.

Is there a way to know something?

Best regards,

Ryo Goto

Hi Goto Ryo,

using the configuration file for our product with no changes, the CCA is automatically on.  This will set the default CCA energy threshold to -72dBm, which is what our product is certified with.

BR. Albin

Dear Albin,

Thank you for your reply and information.
Let me check one point.
Does "the configuration file" refer to WL183xMOD_INI_FCC_CE.INI(or WL183xMOD_INI_FCC_CE_JP.INI)?

Best regards,
Ryo Goto

Hi Albin,

I understand it.
I recheck our environment.
If I have any questions about this item, I will contact you here again.
BR. Goto

Hi Albin,

As additional information, we will send our current "wl18xx-conf.bin" and "wl18xx-conf.txt".

Please find the attached zip file.

As a base INI file, We use "WL1837MOD_INI_FCC_CE_JP.ini" .

Using "WL1837MOD_INI_FCC_CE_JP.ini", the setting is changed to MIMO and 2.4GHz only.

And we created "wl18xx-conf.bin"

The "wl18xx-conf.txt" is printing a dump file of the"wl18xx-conf.bin" into a text file.

1205_2016_ETSIcheck.zip

BR Goto

Dear Goto,

we're facing the same issue.
Was your problem resolved in the end?
Is there a specific set of parameters (rx_cca_threshold) you have changed in order to pass adaptative CCA requirements?

Best Regards,

Thomas

Dear Thomas,

We could not pass by changing CCA related parameters.
Eventually, We reduced the RF Output power to less than 10 dBm.
(In our system, there was no problem even if lowering RF Output power.)
And this problem was solved.
I'm sorry I can not make good advice.

Best regards,
Ryo Goto

Dear Goto,
We will keep this 'solution' as a last resort, good to know.
Thank you for the prompt feedback!
Best regards, Thomas

Dear Thomas,
Thank you for your reply.
If you get a good solution, please share it with me.

Best regards,
Ryo Goto

OK, we will do some testing with CCA parameters, and share the results.
In the end, how did you lower the RF output?
Global attenuation parameters (which ones?) or individual channel tuning?
BR, Thomas

Dear Ryo,

small update: we've passed the CCA testing by lowering TX power, to create more margin in the CCA switch-off threshold (ETSI 1.8)

There will be a FW update from TI somewhere in the coming month(s) (to address ETSI 2.1).

BR, Thomas 

Dear Thomas,

I'm sorry I did not contact you late.

Congratulations on your Pass.
That's good news.
And Thank you for TI's FW update information.

BR, Ryo