Question: What is the status of standardized antenna interface techniques, such as AISG, in relation to the Iuant interface for controlling RET antennas or TMAs within the NG-RAN?
Option 1: Mandatory for all NG-RAN implementations
Option 2: Prohibited due to proprietary NG-RAN protocols
Option 3: Optional but requires additional licensing fees
Option 4: Not prevented, allowing for potential use alongside Iuant
Explanation: The correct answer reflects the principle that the NG-RAN architecture does not prevent the support of standardized antenna interface techniques like AISG. This approach promotes flexibility and interoperability within the network, enabling the use of established standards (e.g., AISG) for controlling antennas, alongside the logical Iuant interface defined within the NG-RAN context. This ensures vendors and operators have choices that can meet various deployment scenarios and requirements.