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CC2642R: Could we adjust the Dwell Time of BLE phy?

Joe Chang3
Prodigy 70 points
Part Number: CC2642R
Other Parts Discussed in Thread: SMARTRFTM-STUDIO

Dear all,

I am trying to pass the Korea KC certification of RF.

The KC need a verification of Dwell Time.

So I am curious about: Could we adjust the Dwell Time by configuring the BLE stack?

Because as I know, the BLE stack and TI RTOS are located in ROM section of MCU.

And I just view the "ble_user_config_stack.c". But there has no brief part of code about this.

Thanks,

Joe Chang

  • 0
    TI__Expert 5345 points

    Joe,

    I will assign an expert in certification who will be able to help you.

    Can you please clarify what SDK version you are using, and what BLE role you're on?

    Thanks,

    Luis

  • 0 in reply to Luis M
    Prodigy 70 points

    Dear Luis,

    The SDK we are using is simplelink_cc13x2_26x2_sdk_3_10_00_53.

    The IDE is CCS 10.1.0.00010 .

    The XDCTools is 3.51.02.21.

    Compiler is ti-cgt-arm_20.2.1.LTS.

    We use BLE as a peripheral device (watch).

    And we are trying to passing the KC certification.

    I looked into following post to see how the Dwell time measurement handled by KC certification labs.

    But I am not pretty sure about that.

    https://e2e.ti.com/support/wireless-connectivity/bluetooth/f/538/t/559022?tisearch=e2e-sitesearch&keymatch=dwell#pi320995=2

    And the following is the Dwell Time measurement requirement from the Lab we are cooperating now.

    But I am also feel confused about the description.

    They said the test is for FHSS, but also need to fix at a frequency.

    So I need to clarify the test requirement as well as how to use "SmartRF Studio 7" to perform the test.

    Thanks a lot,

    Joe Chang

  • 0 in reply to Luis M
    TI__Guru** 101450 points

    Hi Joe,

    Could you specify which specific test / requirement asks you to measure the Dwell time? In my experience, this values is generally not measured. The point is, a Bluetooth Low Energy device should be certified as a "system using digital modulation techniques" (not a "Frequency Hopping System"). The reason behind this is the way advertisements are sent (using always the 3 same channels).

    Still because of the advertisements sent on the three same channels, the Dwell time of a BLE system cannot be measured / modified. That being said, when a connection is established, the Dwell time is then equal to the connection interval (the channel used is changed for each connection event).

    I hope this will help,

    Kind regards,

  • 0 in reply to Clément
    Prodigy 70 points

    Hello Clément,

    So the Dwell Time of a BLE system cannot be modified.

    The Dwell Time is the time length the phy stay on the channel. But it should be effected by the data packet length.

    And in swra601d.pdf

    FCC 15.247, the BLE treated as "system using digital modulation techniques"

    BLE does not classify as FHSS under ETSI specification and instead classifies as other type of wideband
    modulation (see section 4.2.1 of the EN 300 328 specification).

    So, do you know how the KC certification treat the BLE system as FHSS?

    And how to use SmartRF Studio to pass the test?

    The following is some brief description of the test: "Korea KC EMC + RF Certification".

    https://www.sgs.com/en/news/2017/03/south-korea-kc-certification-for-electrical-and-electronic-products


    And the document I provided in previous reply also make me confused.
    Because the FHSS will change the frequency, but the test needs to fix at same frequency.

    Thanks,
    Joe Chang

  • 0 in reply to Joe Chang3
    TI__Guru** 101450 points

    Hi Joe,

    Joe Chang3 said:
    So, do you know how the KC certification treat the BLE system as FHSS?


    I wonder if we had an incomprehension. The Korean certification should NOT consider BLE as a FHSS.

    Regarding SmartRF Studio, you can download it here SMARTRFTM-STUDIO. You can then use the interface in order to set-up the device to exchange data. That being said, I don't know how you want t use it.

    For the rest, have you consulted your local test house. What are their feedback regarding the Dwell time of your product?

    Kind regards,