TCP "Transmission Control Protocol" is a main protocol that works in the transport layer in TCP/IP protocol suit.

It provides a reliable, connection-oriented data transfer mechanism. This ensures delivering the data accurately and in the correct order between communicating devices. This is important in mobile networks, where the wireless medium can be susceptible to higher error rates.

TCP handles lost, corrupted, or out-of-order packets by re-transmitting them, ensuring reliable end-to-end data delivery.

Also it implements flow control and congestion control mechanisms. This is to manage the rate of data transfer between the sender and receiver, which prevents network congestion.