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Nokia 5G RAN Network Operations Expert Sample Questions (Q24-Q29):

NEW QUESTION # 24
What does the NR-ARFCN (NR Absolute Radio Frequency Channel Number) represent in a 5G cell's configuration?

  • A. The percentage of available PRBs currently in use by the cell
  • B. A unique identifier for the cell within the core network's subscriber database
  • C. The number of active alarms currently reported by the cell
  • D. A standardized numeric reference that identifies the specific carrier frequency on which the cell operates

Answer: D

Explanation:
The NR Absolute Radio Frequency Channel Number (NR-ARFCN) is a standardized numbering scheme defined for 5G NR that maps specific numeric values to corresponding carrier frequencies across the supported frequency range. When configuring a cell, the NR-ARFCN value (rather than specifying the frequency directly in MHz) is used to unambiguously identify the exact carrier frequency the cell will operate on, ensuring consistency across equipment from different vendors and alignment with regulatory frequency allocations. Correct NR-ARFCN configuration is essential for frequency planning, neighbor relation setup (since inter-frequency relations reference the target cell's frequency), and avoiding interference with adjacent operators or bands. This parameter is unrelated to subscriber database identifiers, alarm counts, or PRB utilization, all of which are tracked through entirely separate configuration management, fault management, or performance management mechanisms respectively.


NEW QUESTION # 25
How is the Cell Availability KPI typically calculated for a reporting period, and what does this KPI primarily reflect?

  • A. (Total successful handovers / total handover attempts) x 100 - reflects mobility performance
  • B. (Total time the cell was in service / total time in the period) x 100 - reflects how much of the period the cell was able to carry traffic
  • C. (Total active alarms / total cleared alarms) x 100 - reflects fault management efficiency
  • D. (Total downlink throughput / total uplink throughput) x 100 - reflects traffic balance

Answer: B

Explanation:
Cell Availability is an Availability-category KPI that measures the proportion of a given reporting period during which a cell was operationally able to carry traffic - that is, unlocked, in service, and not blocked by a fault. It is calculated as the ratio of the time the cell was actually available to the total duration of the reporting period, expressed as a percentage. Periods of planned maintenance (administrative locking) are sometimes excluded or tracked separately from unplanned outages, depending on operator reporting policy, since the two have different operational implications. This KPI is critical for service level agreement (SLA) reporting and for identifying cells with recurring stability issues such as repeated automatic resets, hardware faults, or transport outages. It is distinct from throughput-based, handover-based, or alarm-count-based ratios, which belong to other KPI categories and answer different operational questions.


NEW QUESTION # 26
A NOC engineer reviewing UE measurement reports notices that two physically adjacent 5G cells are broadcasting the identical Physical Cell Identity (PCI), causing UEs to receive ambiguous reference signals.
What is this condition called, and what is the appropriate remote corrective action?

  • A. This is PCI confusion, and the only remedy is to delete the neighbor relation between the two cells
  • B. This is a PCI collision, and it should be resolved by reassigning a unique PCI value to one of the conflicting cells
  • C. This is a normal configuration and requires no action, since PCI values can be safely reused on adjacent cells
  • D. This is PCI confusion, and it should be resolved by adjusting the cells' reference signal power

Answer: B

Explanation:
A PCI collision occurs when two neighboring (geographically adjacent or mutually visible) cells are configured with the same Physical Cell Identity, causing UEs to be unable to reliably distinguish between them based on their synchronization and reference signals. This leads to degraded reference signal measurements, failed handovers, and potential interference between the two cells' signals. This is distinct from PCI confusion, where two non-adjacent cells that share a PCI are both neighbors of a third common cell, creating ambiguity during handover target selection even though the two same-PCI cells are not directly adjacent. The correct remediation for a PCI collision is a PCI replanning exercise, reassigning one of the conflicting cells to a unique PCI value that avoids both direct reuse with its neighbors and problematic modulo relationships that affect reference signal sequences. This is typically performed remotely via configuration management without requiring a site visit.


NEW QUESTION # 27
What does the term 'Single RAN' refer to in the context of Nokia AirScale base stations?

  • A. A requirement that only one mobile operator can ever use the equipment
  • B. A restriction allowing only one antenna per site
  • C. A type of SIM card used for testing
  • D. A common baseband hardware platform that can support 2G, 3G, 4G, and 5G simultaneously via software configuration

Answer: D

Explanation:
Single RAN describes Nokia's architecture in which a common AirScale hardware platform - including the System Module and compatible radio units - can run multiple radio access technologies (2G GSM, 3G WCDMA, 4G LTE, and 5G NR) concurrently on the same site, with the technology mix and capacity determined by software configuration and licensing rather than separate dedicated hardware per generation.
This dramatically simplifies site footprint, power usage, and lifecycle management, and allows 5G to be introduced onto existing sites by adding software/capacity rather than deploying entirely new cabinets. It is unrelated to antenna count limits or SIM card types, and AirScale platforms also support multi-operator RAN sharing, so it does not restrict usage to a single operator. For NOC personnel, Single RAN means configuration, fault, and software management for several technologies may be addressed through the same base station and management session.


NEW QUESTION # 28
Accessibility KPIs such as RRC Connection Setup Success Rate drop sharply for a single cell, while neighboring cells remain normal. What should the NOC engineer check FIRST?

  • A. Recent alarms or configuration changes specific to that cell, such as hardware/transport faults or recent parameter modifications
  • B. The color theme configuration of the NetAct dashboard
  • C. The billing system records for that cell's coverage area
  • D. The operating system versions of handsets used by subscribers nationwide

Answer: A

Explanation:
When accessibility KPIs such as RRC Connection Setup Success Rate drop sharply for one specific cell while neighboring cells remain normal, the most productive investigation focuses on factors specific to that cell:
reviewing recent alarms (hardware, transport, or synchronization faults affecting only that cell) and checking the configuration management audit trail for any recent parameter change, neighbor relation update, or feature activation that coincided with the KPI drop. Because the issue is localized to a single cell rather than affecting the surrounding area broadly, it is unlikely to be caused by something network-wide such as handset operating system versions used nationwide, and it is entirely unrelated to the billing system or NetAct dashboard appearance settings. Correlating the timing of the KPI degradation with that cell's alarm history and recent CM changes is a standard, effective root-cause approach for localized accessibility issues.


NEW QUESTION # 29
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