Question: In a UTRA FDD system, what is the primary purpose of utilizing DTX when the DPDCH is turned off?
Option 1: To increase the uplink data transmission rate for User Equipment (UE)
Option 2: To enhance voice quality by continuous transmission
Option 3: To minimize interference between UE(s) by reducing transmit power when no information is being sent
Option 4: To prioritize control information over user and voice data
Explanation: DTX, specifically turning off the DPDCH, reduces UE transmit power when no information is being transmitted, minimizing interference between multiple UE(s), improving network efficiency and performance, and optimizing radio resource utilization.