Question: In a 5G NR (New Radio) network, when a UE (User Equipment) experiences an SCG (Secondary Cell Group) failure, how does it determine the ordering of cells in the `measResultNeighCellList` for reporting, if both SS/PBCH block and CSI-RS measurement results are unavailable?
Option 1: Based on RSRQ (Reference Signal Received Quality) measurements, followed by SINR (Signal-to-Interference-plus-Noise Ratio) if RSRQ is not available.
Option 2: Based on RSRP (Reference Signal Received Power) measurements, followed by RSRQ if RSRP is not available, and then SINR as a last resort.
Option 3: Solely based on SINR (Signal-to-Interference-plus-Noise Ratio) measurements, as it provides the most comprehensive view of signal quality.
Option 4: Random ordering, as the specific measurement criteria are left to UE implementation when primary methods are unavailable.
Explanation: In the absence of SS/PBCH block and CSI-RS measurements for cell ordering in `measResultNeighCellList` upon SCG failure, the UE relies on a hierarchical approach: first utilizing RSRP if available, then falling back to RSRQ if RSRP is not available, and finally using SINR as the last option. This method ensures that the best measured cells are listed first based on the most relevant signal strength or quality indicators available at the time of failure detection.