is there any innovative challenge in Nokia

Is there "any"?
There are lots of ;)

I am familiar mostly with local activities (Poland, Wrocław)
We have Nokia Garage - well-prepared space for innovative activities. We organize Innodays - big events of innovations. Our employees make patents with Nokia, we cooperate with universities - now our employees do their Ph.D. at Wrocław University of Science and Technology.

We create innovations in many areas.

Take a look at these links:
https://www.youtube.com/watch?v=lyIA870V2oE
https://www.youtube.com/watch?v=D0fEirXIua4
https://www.youtube.com/watch?v=ezQHlSo-ilU
https://www.youtube.com/watch?v=88P1yoxEosc

And this: global YT Nokia Channel
https://www.youtube.com/channel/UCMdtv1z_kXj7Wd97MA7BjXA

And this: Wrocław YT Nokia Channel
https://www.youtube.com/channel/UC_l25lelCgcHtn3TeSyAQQA

Innovation is at the core of any project at Nokia so my colleagues @Stefanos B. , @Steve T. , @Lindsey S. , @Rita L. and @Karoliina S. might be interested in sharing their perspectives too :)

Hi!

Of course, there are a lot of challenges, often Nokia collaborates with universities and allows Nokia workers to take part in projects or classes from well-known universities to explore new tools and capabilities and there we can explore many different things and cooperate with academia to create even better solutions for the clients, based on a developer perspective!

Hi! Indeed, innovation is the key to success. Nokia has a very active cooperation with universities. That's very important in our business. In addition, we have a wide range of innovators and visionaries among our employees. I'm part of our local innovation team, and we are relentlessly working on discovering new things.
I mentioned innovators and visionaries, but let's not forget dreamers, as to invent, you need a good imagination. :)