If you think in the physical layer of the networking, everything, in the end, interpreted as 1s and 0s. So according to what kind of packet you are sending to the base station, it is treated as it should be. If you're asking how it goes to the internet in the architectural point of view, the following pic might be useful for you.
The figure is from Wireless Communication Networks and Systems 1 st edition, Global edition 2016 Pearson Education, Ltd. Chapter 14 Cory Beard, William Stallings:
Hope this answer is addressing your question!
