• Huawei's own operating system for smartphones and laptops could be ready for use in China by fall this year, a top executive tells CNBC.

• Richard Yu, CEO of Huawei's consumer business says an international version of the operating system could then be ready for international markets by the first or second quarter of 2020.

• It will have Huawei's App Gallery app store installed, he says.

• Yu stresses that Huawei would only launch its own OS if it were permanently banned from using Google's Android or Microsoft's Windows.

Huawei could have its own operating system for smartphones and laptops ready for use in China by fall this year, the head of the company's consumer division told CNBC.

Still, he stressed that would only happen if the company were completely stopped from using Google's GOOGL and Microsoft's MSFT software.

The Chinese technology giant was placed on a U.S. blacklist that required American firms to get permission from the government before selling anything to Huawei. That meant Huawei would no longer be able to license the version of Google's Android operating system that's complete with all of the U.S. firm's services.

However, Washington granted a temporary 90-day reprieve for Huawei, which will allow it to continue using American technology — for now.

Huawei has said in the past that it has its own operating system waiting in the wings if it were to be permanently blocked from Google and Microsoft software. Now, one of the company's top executives has told CNBC that the operating system could be ready by the fourth quarter of this year, with a version for its markets outside of China available in either the first or second quarter of 2020.

"Today, Huawei, we are still committed to Microsoft Windows and Google Android. But if we cannot use that, Huawei will prepare the plan B to use our own OS," Richard Yu, CEO of Huawei's consumer business, told CNBC on Thursday.

If Huawei isn't allowed to use Android, it could be damaging because the phones won't have the Google Play Store where consumers can download apps. Instead, users would need to find other ways to install their favorite applications.

However, Yu said Huawei's own app store, known as the App Gallery, would be available on its own operating system. The App Gallery is installed on Huawei's devices currently, but Google's Play Store is often the default app store for consumers.

The Huawei executive stressed that Huawei's own operating system would only be rolled out if the company were permanently blocked from using Google or Microsoft products.