Question: Which of the following downlink physical channels in a 5G NR network is primarily used for broadcasting system information to all User Equipment (UE) in a cell?
Option 1: Physical Downlink Shared Channel (PDSCH)
Option 2: Physical Downlink Control Channel (PDCCH)
Option 3: Physical Broadcast Channel (PBCH)
Option 4: Demodulation Reference Signal (DM-RS)
Explanation: The Physical Broadcast Channel (PBCH) is specifically designed for broadcasting system information to all User Equipment (UE) in a cell, making it essential for initial access and system configuration. In contrast, PDSCH is used for shared data transmission, PDCCH for control information, and DM-RS, being a reference signal, does not carry higher-layer information but aids in demodulation. Thus, PBCH's role aligns with the described function.