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| Section | Objectives |
|---|---|
| Topic 1: Radio Network Optimization | - KPI analysis and optimization - Interference analysis and mitigation - Mobility optimization |
| Topic 2: Radio Network Planning | - Capacity planning - Coverage planning - Site selection and dimensioning |
| Topic 3: Troubleshooting and Performance Enhancement | - Fault diagnosis in 5G networks - Performance tuning methods |
| Topic 4: 5G Radio Network Fundamentals | - 5G NR system architecture and principles - Radio access network basics |
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NEW QUESTION # 21
Which scenario requires a measurement-based SCG addition but does not allow blind SCG addition?
Answer: A
Explanation:
Periodic Secondary Cell Group (SCG) addition after network access is the intended answer because the Huawei NSA procedure described in the material requires measurement-based SCG addition for subsequent periodic additions.
In E-UTRA-NR Dual Connectivity (EN-DC), the LTE eNodeB operates as the Master Node (MeNB), while the NR gNodeB operates as the Secondary Node (SgNB).
SCG addition allows the network to establish NR connectivity for a UE already connected to the LTE master network.
Huawei's implementation distinguishes measurement-based SCG addition from blind SCG addition.
In measurement-based addition, the MeNB configures the UE to measure neighboring NR cells. The UE reports eligible NR measurements, commonly through a B1 measurement-reporting procedure, enabling the network to select an appropriate NR secondary cell.
Blind addition does not require a fresh qualifying measurement report before initiating the corresponding addition attempt.
According to the supplied implementation description, blind addition is restricted to initial addition scenarios, including initial access, incoming handover, and incoming RRC connection reestablishment.
Periodic addition occurs after the initial addition opportunity and therefore requires measurement-based selection under this configuration.
Consequently, option C is the intended answer.
Official Reference: 3GPP TS 37.340, E-UTRA and NR Multi-Connectivity , topic Secondary Node Addition and Modification Procedures .
NEW QUESTION # 22
What is the maximum coverage altitude for low-attitude 5G drone scenarios?
Answer: C
Explanation:
The expected maximum coverage altitude is 1,000 meters, according to Huawei's proposed air-to-ground cellular communication architecture for connected-drone applications.
Huawei's Low-Altitude Connected Drone Flight Safety Test Report , published in cooperation with the Civil Aviation Administration of China (CAAC), differentiates the planned aerial coverage capabilities of 4G and
5G systems.
The report describes an integrated air-to-ground communication framework supporting 4G aerial coverage below 300 meters and 5G aerial coverage below 1,000 meters.
This capability is associated with extending cellular-network coverage into the low-altitude airspace used by connected UAVs.
Aerial radio-network planning differs substantially from conventional terrestrial coverage planning. UAVs frequently experience line-of-sight propagation toward multiple base stations, increasing the probability of inter-cell interference.
Traditional antenna downtilt configurations are primarily optimized for ground-level terminals. As UAV altitude increases, serving-cell coverage may depend on antenna sidelobes, and radio-link quality can fluctuate despite relatively strong received signal power.
Technologies such as Massive MIMO, three-dimensional beamforming, antenna optimization, and interference coordination help address these challenges.
The specified 1,000-meter altitude represents the coverage target described in the cited architecture rather than a guaranteed operating height for every commercial deployment.
Official Reference: Huawei/CAAC, Low-Altitude Connected Drone Flight Safety Test Report , Section II, Concepts of Drone Flight Safety , Figure 6.
NEW QUESTION # 23
What is the broadcast periodicity of the MIB in 5G?
Answer: C
Explanation:
The NR Master Information Block (MIB) has a nominal broadcast scheduling periodicity of 80 milliseconds, with repetitions transmitted within the applicable MIB scheduling period.
The MIB is an essential component of 5G NR system-information acquisition. It is carried on the Broadcast Channel (BCH), physically transmitted through the Physical Broadcast Channel (PBCH) within a Synchronization Signal/PBCH Block (SSB).
The MIB contains information required for the UE to acquire System Information Block 1 (SIB1), including essential system-frame and control-channel configuration parameters.
Its information elements include the system frame number components, subcarrier spacing indication, SSB subcarrier offset, and parameters associated with the initial PDCCH configuration.
A distinction must be made between the MIB's nominal 80 ms scheduling periodicity and the repetition periodicity associated with SSB transmission.
An SSB burst may repeat at intervals such as 5, 10, 20, 40, 80, or 160 ms, depending on the applicable configuration and operating procedure.
For typical deployments, the UE may therefore receive repeated PBCH transmissions more frequently than every 80 ms.
The question concerns the standardized nominal MIB scheduling period rather than the interval between every PBCH transmission.
Therefore, 80 ms is the correct answer.
Official Reference: 3GPP TS 38.331, Section 5.2.1.2, System Information Scheduling ; TS 38.212, Section
7.1, Broadcast Channel .
NEW QUESTION # 24
Assume cell A has a primary synchronization code of 2 and a secondary synchronization code of 1. What is cell A's PCI?
Answer: A
Explanation:
The Physical Cell Identity (PCI) is calculated using the primary and secondary synchronization identity components.
In 5G NR, the PCI identifies a radio cell at the physical layer and assists the UE with cell synchronization, reference-signal processing, and physical-channel operations.
According to 3GPP TS 38.211, the PCI is calculated using:
N_ID