Ameba provides a country code configuration table where each country code corresponds to specific channel plans and transmit power
to comply with wireless regulations across different countries.
Users can view and modify this file at: component/soc/usrcfg/amebaxxx/ameba_wifi_country_code_table_usrcfg.c
When enabled, the device automatically selects the most frequently broadcasted country code from nearby APs’ Country Elements,
dynamically adapting to local radio regulations.
enumrtw_txpwr_lmt{TXPWR_LMT_FCC=0,/**< Federal Communications Commission (USA) */TXPWR_LMT_MKK=1,/**< Japan */TXPWR_LMT_ETSI=2,/**< European Telecommunications Standards Institute (CE) */TXPWR_LMT_IC=3,/**< Canada */TXPWR_LMT_KCC=4,/**< South Korea */TXPWR_LMT_ACMA=5,/**< Australia */TXPWR_LMT_CHILE=6,/**< Chile */TXPWR_LMT_MEXICO=7,/**< Mexico */TXPWR_LMT_WW=8,/**< Worldwide (Minimum of all) */TXPWR_LMT_GL=9,/**< Global (Legacy compatibility) */TXPWR_LMT_UKRAINE=10,/**< Ukraine */TXPWR_LMT_CN=11,/**< China */TXPWR_LMT_QATAR=12,/**< Qatar */TXPWR_LMT_UK=13,/**< United Kingdom */TXPWR_LMT_NCC=14,/**< Taiwan */TXPWR_LMT_EXT=15,/**< Custom *//* ===== Add new power limit above this line. ===== */TXPWR_LMT_CONST_MAX/**< Boundary value */};
Adaptivity is an automatic channel access protocol that inhibits a device from transmitting on a channel when ongoing transmissions are detected. Devices with a maximum declared RF output power level greater than 10 dBm effective isotropic radiated power (e.i.r.p.) are required to implement this Adaptivity protocol.
Since December 31, 2017, ETSI has required Adaptivity certification. The applicable standards are ETSI EN 300 328 V2.2.2 for 2.4 GHz bands and ETSI EN 301 893 V2.1.1 for 5 GHz bands.
The Adaptivity test procedures are specified by ETSI as follows:
Establish a connection between the DUT (Device Under Test) and the companion device and start data transmission.
Add the interference signal, and ensure that out-of-band blocking signals are also added for 2G compliance.
Check whether the DUT has stopped transmitting data.
The DUT is restricted to transmitting only short control signals, such as acknowledgment (ACK) frames, to the companion device.
Check the test result.
For 2G compliance, check whether the Tx duty cycle is below 10% within any 50ms interval. If yes, pass; otherwise, fail.
For 5G compliance, check whether the Tx duty cycle is below 5% within any 50ms interval. If yes, pass; otherwise, fail.
Repeat the steps above for each channel, bandwidth, and mode.
Pout is the maximum TX power of test object. The interference signal must exceed BW of the test object and have a 100% duty cycle.
Realtek conducts testing under the most stringent conditions in the LAB.
2G:TL=-70dBm/MHz5G:TL=-75dBm/MHz
The table below illustrates the interference power with different frequencies and bandwidths. When the interference power exceeds the threshold, the MAC layer will be instructed to pause data transmission.
Item
2G
5G
20MHZ
40MHZ
20MHZ
40MHZ
80MHZ
160MHZ
Interference Power (dBm)
-57
-54
-62
-59
-56
-53
The following section details the software configuration and debug SOP essential for successfully passing the Adaptivity test.
Ameba supports multiple EDCCA modes, please refer to the configuration parameters rtw_edcca_mode. For regulatory testing, the device must be configured to the specific EDCCA mode required by the applicable regulations.
Once connected to the AP, retrieve the current EDCCA threshold using the following command:
AT+WLDBG=get_edcca_th
In most scenarios, the default settings suffice to pass the Adaptivity test. If modification is required, adjust the EDCCA threshold using the following command:
AT+WLDBG=fix_edcca_th<value>
Note
The value’s unit is dBm and the scope is [-60, -80], and the minimum step is 1.
Once connected to the AP, retrieve the current EDCCA threshold using the following command:
ATWZget_edcca_th
In most scenarios, the default settings suffice to pass the Adaptivity test. If modification is required, adjust the EDCCA threshold using the following command:
ATWZfix_edcca_th<value>
Note
The value’s unit is dBm, the scope is [-60, -80], and the minimum step is 1.
The SDK defaults to supporting DFS Slave functionality, allowing the STA to automatically process the CSA IE in AP beacon and action frames.
Although DFS regulations vary across different countries and regions in terms of specific requirements, the primary impact is on the DFS Master.
For a DFS Slave, meeting the following requirements is generally sufficient for regulatory testing:
Cease Wi-Fi transmissions on the current channel as required by the AP
Switch to the new channel punctually as required by the AP
The process for obtaining a Wi-Fi Logo Certificate is illustrated in the below figure:
The members of the Wi-Fi Alliance (WFA) must submit certification applications via the online “Certification System” (accessible on the WFA official website). Subsequently, they shall select an Authorized Test Laboratory (ATL), inquire about quotation details, and arrange for test scheduling.
The customer contacts relevant engineers at Realtek to seek technical support for certification compliance.
The customer confirms the certification pathway (FlexTrack Certification, QuickTrack Certification, or Derivative Certification, refer to Three Certification Pathways) based on their own products.
The customer submits a test application to the WFA and obtains a Certification ID (CID).
The customer coordinates with the ATL to confirm the test date, settle financial arrangements, and provide the test devices.
The ATL does the tests and issues test reports to both the customer and the WFA.
If some items of tests is failed, the customer works with Realtek to debug and resolve the issues, then re-submits the product for retesting (additional fees may be required to be paid to the ATL).
WFA staff review the test results. If the results are verified as valid and the product passes the tests successfully, and no other reasons for rejecting the certification are identified, the WFA will issue the certificate for the product.
We have each established a laboratory with test environments identical to those of ATLs. The laboratory can be used for pre-testing, as well as analyzing and debugging issues encountered during the certification process.
Within the WFA certification framework, there are three certification pathways: FlexTrack Certification, QuickTrack Certification, and Derivative Certification. These three pathways cater to different product development models, offering differentiated options in terms of test scope, cycle, and cost while ensuring the rigor of certification. Detailed descriptions are as follows:
Currently, the company has not yet obtained separate certification for this chip independently. However, some customers have obtained certificates for their products that incorporate this chip model.
