Question: What is the maximum allowed frequency error for a UE's modulated carrier frequency during ProSe sidelink transmissions, observed over one time slot (0.5 ms)?
Option 1: ±0.01 PPM
Option 2: ±0.1 PPM
Option 3: ±1 PPM
Option 4: ±10 PPM
Explanation: The UE's modulated carrier frequency for ProSe sidelink transmissions must be accurate to within ±0.1 PPM, as specified in the 3GPP TS 36.101 standard. This ensures that the UE's transmission is synchronized with the synchronization source, which can be an E-UTRA Node B or another ProSe UE transmitting sidelink synchronization signals.