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| Section | Objectives |
|---|---|
| Topic 1: Remote Operations of 5G Radio Access Networks | - 5G RAN Operations Center Procedures
|
| Topic 2: Fault and Alarm Management | - Monitoring and Troubleshooting
|
| Topic 3: Software Management | - Base Station Software Operations
|
| Topic 4: Configuration Management | - Parameter Administration
|
| Topic 5: 5G RAN Products and Solutions Management | - Network Connectivity and Access
|
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NEW QUESTION # 11
After completing a software upgrade and subsequent configuration adjustments at a site, why is it important for the NOC engineer to update the site's maintenance records and change documentation?
Answer: B
Explanation:
Maintaining accurate and current maintenance records and change documentation - detailing what changes were made, when they were performed, by whom, and the reasoning or ticket reference behind them - provides essential context for future operations. If an issue arises at the site days, weeks, or months later, having a clear record of recent changes allows engineers investigating the new issue to quickly identify whether it might be related to a recent software upgrade or configuration adjustment, significantly speeding up root-cause analysis. This documentation also supports configuration audits, compliance requirements, and knowledge transfer between team members or shifts, ensuring continuity even as different engineers interact with the site over time. While documentation does have value for regulatory and audit purposes, dismissing it as having no operational value is incorrect - it directly supports troubleshooting efficiency. Documentation itself does not trigger software downloads or determine technical parameters like PCI, which are governed by separate configuration and software lifecycle processes.
NEW QUESTION # 12
A NOC engineer is trying to isolate whether a fault originates in the baseband processing unit or in an RF module of an AirScale BTS. What is a useful FIRST diagnostic step?
Answer: A
Explanation:
When isolating a fault between baseband processing units and RF modules, checking the status and alarm details of the interconnecting interface - typically a CPRI or eCPRI link in AirScale architectures - between the System Module and the Radio unit is a logical first step. Alarms or abnormal status on this link can quickly reveal whether the problem lies in the connection itself (such as a fiber/cable fault or configuration mismatch) or within one of the connected components. This follows the principle of checking interfaces and boundaries before assuming a specific component has failed, avoiding unnecessary or premature hardware replacement. Replacing the antenna skips this diagnostic step entirely and risks an unwarranted field action.
Restarting NetAct is a network-wide action inappropriate for a single-site fault. Increasing transmit power to
'test' a suspected hardware issue is not a valid diagnostic method and could create interference.
NEW QUESTION # 13
In an EN-DC (E-UTRA New Radio Dual Connectivity) configuration, what role does the 5G NR cell typically play relative to the LTE cell?
Answer: B
Explanation:
EN-DC is a non-standalone (NSA) 5G deployment architecture in which a UE maintains simultaneous connections to an LTE eNB acting as the Master Node (MN) and a 5G NR gNB acting as a Secondary Node (SN). In this configuration, the LTE eNB anchors the control-plane connection to the Evolved Packet Core (EPC) and handles mobility management and signaling, while the NR cell primarily contributes additional user-plane throughput and capacity through dual connectivity, often substantially increasing the data rates available to the UE. This architecture allows operators to introduce 5G capacity using existing 4G core infrastructure, which is a common early-stage deployment strategy. Correct configuration of the EN-DC relation between the LTE and NR cells - including neighbor relations, frequency information, and capability signaling - is essential for the UE to be directed to add the secondary NR connection. EN-DC does not require identical PCI values between the LTE and NR layers, since they operate as distinct cells with independent identity spaces.
NEW QUESTION # 14
A cell repeatedly raises and clears 'Cell Unavailable' alarms. Performance data shows PRB utilization dropping to zero during exactly the same periods. Which area should be investigated FIRST as the likely root cause?
Answer: B
Explanation:
When a cell repeatedly raises and clears 'Cell Unavailable' alarms, and PRB utilization simultaneously drops to zero during exactly those same intervals, this pattern strongly indicates the cell is genuinely going out of service intermittently, rather than a display or reporting artifact. The investigation should focus on causes capable of producing repeated, short-duration outages: transport link instability (brief link flaps causing loss of the cell's connectivity), loss of synchronization reference (particularly significant for TDD 5G, where sync loss can force a cell to stop transmitting to avoid interference), or unexpected hardware resets/restarts of the baseband or radio unit, potentially linked to environmental issues such as overheating or power fluctuations.
NetAct UI theme settings, subscriber handset models, and the billing system are entirely unrelated to RAN service availability and would not explain this correlated alarm and KPI pattern. Correlating alarm timing with PM data and environmental/transport alarms is a key NOC diagnostic technique.
NEW QUESTION # 15
A KPI tracks the percentage of established connections or sessions that end abnormally ('dropped') rather than through a normal release procedure. Which KPI category does this belong to?
Answer: B
Explanation:
Retainability KPIs measure whether connections or sessions that have been successfully established remain stable and are terminated through normal procedures, rather than ending abnormally (a 'drop'). A high abnormal release/drop rate indicates retainability problems - subscribers may experience calls or data sessions ending unexpectedly mid-use, significantly impacting user experience even when the initial connection (accessibility) succeeded. This differs from Accessibility, which measures the success of the initial connection attempt; Mobility, which specifically measures handover performance; and Availability, which measures whether a cell or site is in service over time. Retainability degradation can result from radio link failures, interference, transport instability, or hardware issues affecting an already-active connection. NOC engineers monitoring retainability KPIs focus on the stability of in-progress sessions, a key contributor to overall subscriber-perceived quality of service.
NEW QUESTION # 16
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