Answer:
The connection between a mobile device and radio tower.
The chip that control the radio frequency waves within a device.
A list of radio frequencies.
Baseband can be defined as a technology within the the mobile devices that creates and manages interface to wireless network such as radio transmitters and the radio receivers.
Primary Rate Interference PRI on the other hand is a connection that is configured by many countries. This configuration has specified data and control channels with specified speed for specified countries depending upon the T-carriers and E-carriers.