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| Section | Objectives |
|---|---|
| Network Operations in 5G RAN | - Operations Center procedures
|
| 5G RAN Systems and Fault Management | - Software and configuration management
|
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NEW QUESTION # 95
What is a 'threshold crossing alert' (TCA), and how does it differ from a standard equipment fault alarm?
Answer: A
Explanation:
A threshold crossing alert (TCA) is generated when a monitored performance counter or KPI - such as PRB utilization, processor load, or a quality metric - crosses an operator-configured threshold value, providing visibility into a performance-related condition that may or may not correspond to an actual hardware fault.
For example, sustained high PRB utilization on a cell might trigger a TCA flagging a capacity concern, prompting capacity planning or optimization actions, even though no equipment has failed. This differs fundamentally from a standard equipment fault alarm, which is raised in direct response to a detected hardware or communication failure condition. TCAs are configurable by the operator, allowing thresholds to be tuned to the network's specific performance targets and capacity planning needs, and they are not limited to software license conditions, nor are they fixed, unconfigurable values.
NEW QUESTION # 96
A NOC engineer is investigating subscriber complaints of being unable to access data services even though their devices show a strong 5G signal and successfully camp on the cell. Which KPI should the engineer examine first to determine whether the issue lies in establishing the data bearer itself?
Answer: B
Explanation:
If a device successfully camps on a cell and shows strong signal levels but cannot access data services, the issue most likely lies beyond the initial radio connection - specifically in establishing the data bearer (PDU session in 5G, analogous to E-RAB in 4G) required to carry user-plane traffic to the core network. The PDU Session/E-RAB Setup Success Rate KPI directly measures how often these bearer establishment procedures succeed, and a low value points to problems such as core network signaling failures, transport issues toward the user-plane gateway, configuration mismatches, or resource allocation failures at the RAN. Cell Availability simply confirms the cell is operational, Handover Success Rate is only relevant once a session is active and mobility occurs, and strong RSRP only confirms good radio coverage - none of these directly explain a failure to establish the data session itself, making the PDU Session/E-RAB Setup Success Rate the correct first KPI to examine.
NEW QUESTION # 97
Before applying a significant parameter change to a live production cell, what best practice should a NOC engineer follow regarding the cell's current configuration?
Answer: C
Explanation:
Taking a configuration backup or snapshot of the current parameter settings before applying a significant change is a fundamental change management best practice. If the new configuration causes unexpected behavior - such as degraded KPIs, connectivity issues, or unintended interactions with other parameters - having a known-good baseline allows the engineer to quickly roll back to the previous configuration, minimizing service impact and downtime while the root cause is investigated. While some configuration management tools may offer change history or versioning features, relying solely on this without an explicit pre-change backup is risky, and the assumption that changes are always automatically and fully reversible is incorrect. Deleting the existing configuration before applying a new one is highly disruptive and would cause an outage. Disabling alarm reporting during a change is dangerous, as it would prevent the NOC from detecting genuine problems introduced by the change itself, undermining the very monitoring needed to assess the change's impact.
NEW QUESTION # 98
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: D
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 # 99
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: B
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 # 100
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