Question: What is one of the purposes of inter-system Mobility Robustness Optimisation in a network?
Option 1: To detect non-optimal use of network resources and prevent Unnecessary Handovers.
Option 2: To improve handover success rates between different radio access technologies.
Option 3: To reduce the number of handovers required for a UE moving at high speed.
Option 4: To increase the threshold for triggering inter-system handovers.
Explanation: Inter-system Mobility Robustness Optimisation aims to detect non-optimal use of network resources, such as Unnecessary Handovers (HO) to another system. This is achieved by evaluating the quality of the source system's coverage and comparing it with the target system's coverage. If the handover is deemed unnecessary, a report is sent to the source system, which can then adjust its parameters to prevent similar unnecessary handovers in the future.