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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 # 115
Before performing a remote software upgrade on a base station, what should a NOC engineer ensure has been completed regarding the site's current state?
Answer: D
Explanation:
Taking and verifying a current configuration and software backup before a remote software upgrade is a fundamental pre-upgrade step. This backup captures the site's known-working state - including its current software load and configuration parameters - immediately before changes are introduced. If the upgrade fails, results in unexpected behavior, or the automatic fallback mechanism does not fully restore normal operation, this backup provides a verified restore point that the NOC can use to recover the site to its prior working condition, minimizing downtime and avoiding the need for a more disruptive recovery process such as a full re-commissioning. Deleting alarm history, changing the PLMN ID, or removing neighbor relations are not standard or appropriate pre-upgrade steps; they would either destroy useful troubleshooting history, disrupt subscriber service through incorrect network identification, or unnecessarily degrade mobility performance, none of which relate to safely preparing for a software upgrade.
NEW QUESTION # 116
Why is it important for the NOC engineer to confirm the affected cell is locked and showing as out-of-service (in a planned state) before instructing the field engineer to disconnect any RF cabling at the antenna?
Answer: B
Explanation:
Confirming that a cell is locked and in a planned out-of-service state before any physical RF disconnection serves two important purposes. From a safety perspective, a locked cell is not actively transmitting in normal traffic-carrying operation, reducing RF exposure risk to the field engineer working near the antenna or cabling. From an operational perspective, performing the disconnection on a cell already in a planned, controlled state ensures that the resulting loss of RF connectivity is correctly interpreted within the context of an ongoing planned maintenance activity, rather than triggering an unplanned fault condition that might generate urgent alarms, automatic notifications, or even unnecessary escalations to other teams who are unaware that work is in progress. Locking a cell does not increase its transmit power (the opposite is true - it stops normal transmission), does not trigger any automated parts dispatch, and has no effect on PLMN ID or network-wide UE registration, which are unrelated to a single cell's administrative state.
NEW QUESTION # 117
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: C
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 # 118
What is the AISG bus used for in the context of antenna line device management?
Answer: B
Explanation:
The Antenna Interface Standards Group (AISG) bus is a standardized communication interface (typically layered over RS-485 and sometimes carried over the same coaxial feeder cable as the RF signal, using a technique that separates the control signal from the RF) that enables the base station's control unit to discover, communicate with, and control Antenna Line Devices (ALDs) mounted on or near the antenna - most commonly Remote Electrical Tilt (RET) actuators and Tower Mounted Amplifiers (TMAs). Through the AISG bus, the system can remotely query device status, read sensor data such as current tilt position, and send control commands such as tilt adjustments or TMA gain settings. This is entirely distinct from the CPRI
/eCPRI fiber links carrying baseband-to-RF digital radio signals, the O and M IP network connecting the site to centralized management systems like NetAct, or the DC power distribution supplying equipment - each of which serves a different, non-overlapping function within the site's overall infrastructure.
NEW QUESTION # 119
What operational benefit does the Automatic Neighbor Relation (ANR) function provide to a NOC team managing 5G RAN configuration?
Answer: C
Explanation:
The Automatic Neighbor Relation (ANR) function reduces the manual configuration burden associated with maintaining accurate neighbor lists across a large RAN by using UE measurement reports to detect cells that UEs can actually see and successfully measure in the field. When a UE reports a previously unconfigured neighboring cell with sufficient signal quality, ANR can automatically add the appropriate neighbor relation (and, where applicable, retrieve the necessary identification information for that neighbor) so that future handovers toward that cell can be evaluated and executed. This is particularly valuable in dense, frequently changing network environments where manually planning every neighbor relation - especially across vendor or technology boundaries - would be time-consuming and error-prone. ANR does not address hardware faults, PLMN configuration, or transmit power adjustments, which are governed by separate fault management and RF parameter processes respectively, but it significantly improves the completeness and accuracy of neighbor relation databases that mobility KPIs depend on.
NEW QUESTION # 120
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