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| Section | Objectives |
|---|---|
| Topic 1: 5G RAN Systems and Fault Management | - Software and configuration management
|
| Topic 2: Network Operations in 5G RAN | - Operations Center procedures
|
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NEW QUESTION # 31
Which of the following best describes 'fault isolation' as performed by NOC technical support before deciding whether to dispatch a field engineer?
Answer: A
Explanation:
Fault isolation is the systematic process by which NOC technical support narrows down the likely location and cause of a fault using all available remote diagnostic information, before deciding whether a remote fix is possible or a field dispatch is required. This includes reviewing active alarms and their correlation (distinguishing root-cause from symptom alarms), examining relevant performance management data for anomalies, checking the status of interfaces between functional domains such as baseband-to-RF links or transport interfaces, and reviewing element logs where available. The goal is to determine whether the fault most likely resides in the baseband processing unit, an RF module, the transport network, or an external
/environmental factor such as power or cooling, so that any field dispatch is properly scoped with the correct parts, tools, and instructions. Randomly replacing components, assuming a full rebuild is always needed, or ignoring correlation data are inefficient approaches that proper fault isolation is designed to avoid.
NEW QUESTION # 32
What is the function of cell reselection priority parameters configured for idle-mode UEs across different frequency layers (e.g., 5G vs. 4G, or different 5G bands)?
Answer: A
Explanation:
Cell reselection priority parameters are broadcast to idle-mode UEs and inform them how to prioritize different frequency layers (such as a 5G band versus an LTE band, or multiple 5G bands) when more than one suitable cell is available for camping. By assigning higher reselection priority to certain layers, an operator can influence idle-mode UE distribution - for example, encouraging UEs to camp on a 5G layer where available to ensure faster initial access to 5G services, or directing UEs away from a layer that is being prepared for maintenance. These parameters work alongside reselection thresholds and timers that prevent excessive reselection (ping-ponging) between layers. They do not control network registration eligibility (which depends on subscription and PLMN matching), transmit power limits (a separate RF parameter), or encryption key management (a security function handled through different mechanisms), but they play an important role in idle-mode load distribution and user experience from the moment a device wakes up.
NEW QUESTION # 33
Which KPI category does the RRC Connection Setup Success Rate primarily belong to, and what does a sustained drop in this KPI typically indicate?
Answer: D
Explanation:
The RRC Connection Setup Success Rate is one of the primary Accessibility KPIs, measuring how reliably User Equipment (UE) can successfully establish a Radio Resource Control connection with the network when attempting to access services. A sustained decline in this KPI indicates that a meaningful proportion of connection attempts are failing before the UE even reaches an active signaling state, which directly impacts a subscriber's ability to begin a session. Common causes include radio interference, congestion-related admission control rejections, configuration errors affecting random access or initial signaling parameters, or hardware faults on the baseband or RF units. This differs from Mobility KPIs (which assess handover performance for already-connected UEs), Integrity KPIs (which assess throughput and quality during an active session), and Availability KPIs (which assess whether the cell itself is in service). Accessibility issues should be prioritized since they affect every subscriber attempting to use the cell.
NEW QUESTION # 34
A NOC engineer notices that UEs in a cell are triggering handovers to a neighboring cell and then quickly handing back, repeating this cycle (a 'ping-pong' pattern). Which parameter adjustment is most likely to help reduce this behavior?
Answer: A
Explanation:
Ping-pong handovers occur when a UE repeatedly hands over back and forth between two cells, often because the signal levels of both cells are very close to each other near the cell boundary, causing the handover trigger condition to be met in alternating directions in quick succession. Handover events (such as an A3 event, where a neighbor's signal becomes a defined offset better than the serving cell) include configurable hysteresis and time-to-trigger parameters. Increasing the hysteresis margin requires a more substantial and sustained signal difference before a handover is triggered, while increasing the time-to- trigger requires the condition to be met for a longer continuous duration before the measurement report is sent. Both adjustments reduce sensitivity to short-term signal fluctuations, directly addressing ping-ponging.
Disabling the neighbor relation would prevent legitimate handovers entirely, harming mobility performance; changing PCI values or bandwidth does not address the underlying signal-level trigger sensitivity that causes ping-pong behavior.
NEW QUESTION # 35
A field engineer needs to work in close proximity to an antenna to replace a Tower Mounted Amplifier (TMA). What is the NOC engineer's most important responsibility before the field engineer begins this work?
Answer: A
Explanation:
When a field engineer needs to work in close physical proximity to an antenna - such as when replacing a Tower Mounted Amplifier - radio frequency (RF) exposure becomes a safety consideration, since active transmission from the antenna could expose the engineer to RF energy levels exceeding safe limits at close range. The NOC engineer's most important responsibility in this scenario is to coordinate placing the affected cell's RF transmission into a safe state - typically by locking the cell - before the field engineer begins work near the antenna, and to confirm this state is in place before giving the go-ahead. This directly supports the field engineer's physical safety. Increasing transmit power would worsen RF exposure risk and is the opposite of the correct action; scheduling for busy hours is irrelevant to the safety requirement and would also affect more subscribers; and disabling alarm notifications would reduce the NOC's situational awareness during the activity without providing any safety benefit.
NEW QUESTION # 36
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