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| Section | Objectives |
|---|---|
| Topic 1: 5G RAN Systems and Fault Management | - Software and configuration management
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| Topic 2: Network Operations in 5G RAN | - Operations Center procedures
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NEW QUESTION # 80
A NOC engineer needs to recover a base station from a state where its parameter settings have been corrupted, but the underlying software load is functioning correctly. Which type of backup would be most directly applicable to resolving this specific issue?
Answer: B
Explanation:
When the issue is specifically that parameter/configuration data has become corrupted while the underlying software load remains functional, the most directly applicable recovery resource is a configuration backup - which contains the parameter settings (cell configuration, neighbor relations, transport settings, and so on) independent of the software image. Restoring from a configuration backup can address the corrupted settings without the additional time and disruption of reinstalling or reactivating software, which would be unnecessary in this scenario since the software itself is not the problem. Configuration data is a distinct dataset from the software image, not embedded within it, which is precisely why configuration-only backups exist as a lighter-weight option for scenarios like this. Alarm history and PM counter exports are records of operational events and measurements respectively - neither contains the parameter configuration data needed to restore an element's settings, making them unsuitable for this recovery scenario.
NEW QUESTION # 81
When planning a maintenance window for a software activation affecting multiple cells at a site, which factor is most important for the NOC team to consider in order to minimize subscriber impact?
Answer: C
Explanation:
Because software activation typically requires affected cells to restart, briefly interrupting service for any actively connected UEs, the most important factor in selecting a maintenance window is identifying a time period when traffic at the site is at its lowest, based on historical traffic pattern analysis. Sites can have different busy-hour profiles depending on their location and the population they serve - for example, a site near a business district may have low traffic late at night, while a site in a residential entertainment area might have different patterns - so generic assumptions about 'off-peak' hours should ideally be validated against actual historical data for that specific site. Software version numbers, PLMN IDs, and current alarm counts have no inherent relationship to traffic levels and should not be used as proxies for determining the best maintenance window; traffic pattern data is the relevant and reliable input for this planning decision.
NEW QUESTION # 82
During PCI planning for a dense cluster of 5G cells, why is it important to avoid assigning PCI values that result in the same PCI modulo group (such as the same PCI mod 3 value) to closely located neighboring cells?
Answer: C
Explanation:
The Physical Cell Identity has mathematical relationships - such as PCI mod 3 and PCI mod 30 - that determine which specific resource elements certain reference signal sequences are mapped to within the radio frame. When two closely located, mutually visible cells share the same PCI mod 3 group, their reference signals for that group occupy the same time-frequency resources, increasing the likelihood of mutual interference on those reference signals. This can degrade channel estimation and measurement accuracy for UEs near the cell edge between the two cells, indirectly impacting handover performance and link quality.
Careful PCI planning therefore considers not just avoiding direct PCI collisions (identical PCI on neighbors) but also distributing PCI mod group assignments across a cluster to minimize this reference signal overlap.
PCI mod values have no bearing on software versioning, bandwidth limits, or Tracking Area grouping, which are configured through entirely separate parameters.
NEW QUESTION # 83
A NOC engineer is preparing to remotely change a cell's duplex mode configuration from FDD to TDD. What critical dependency must be verified before this change can be successfully applied?
Answer: D
Explanation:
TDD (Time Division Duplex) operation requires precise time synchronization between cells, because uplink and downlink transmissions share the same frequency but are separated in time according to a coordinated frame structure. If neighboring TDD cells are not tightly synchronized, their uplink and downlink slots can overlap, causing severe cross-interference between cells. Before converting a cell's duplex mode to TDD, it is therefore critical to verify that the site has access to a reliable, accurate timing/synchronization reference - typically GNSS (such as GPS) or a network-based reference distributed via PTP (Precision Time Protocol) - and that the synchronization source is stable and within required accuracy limits. FDD (Frequency Division Duplex), by contrast, uses separate frequencies for uplink and downlink and does not have this same stringent synchronization dependency. SFTP connectivity, PLMN matching, and alarm acknowledgment status, while operationally relevant in general, are not the critical technical dependency specific to a duplex mode change.
NEW QUESTION # 84
During a remote piloting activity, the NOC engineer and field engineer are unable to bring a replaced RF unit into service despite following standard verification and troubleshooting steps, and a hardware fault on the new unit itself is suspected. What is the most appropriate next step?
Answer: A
Explanation:
When standard remote troubleshooting and on-site verification steps have been exhausted and a hardware fault on the newly installed unit itself is suspected, continuing to repeat the same steps is unlikely to be productive and delays resolution. The appropriate next step is to escalate the issue to the next level of support
- which may be a specialized technical support team or the equipment vendor's technical assistance center - providing clear documentation of what steps have already been performed, the specific symptoms observed (such as particular alarm codes or link status indications), and the basis for suspecting a hardware fault on the new unit. This documentation allows the receiving team to avoid repeating already-completed steps and to focus on deeper diagnosis, which may lead to confirming a defective unit and arranging a further replacement. Leaving the site without resolution or communication abandons the activity in an incomplete state, and deleting the cell's configuration would not address a suspected hardware defect and would create additional, unnecessary recovery work.
NEW QUESTION # 85
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