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| Section | Objectives |
|---|---|
| 5G Radio Network Fundamentals | - 5G NR system architecture and principles - Radio access network basics |
| Troubleshooting and Performance Enhancement | - Performance tuning methods - Fault diagnosis in 5G networks |
| Radio Network Planning | - Coverage planning - Capacity planning - Site selection and dimensioning |
| Radio Network Optimization | - Interference analysis and mitigation - KPI analysis and optimization - Mobility optimization |
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NEW QUESTION # 51
Which of the following cannot be transmitted on the PDCCH?
Answer: C
Explanation:
The Precoding Matrix Indicator (PMI) is the correct answer because PMI is primarily reported by the UE as part of Channel State Information (CSI), rather than being transmitted as a conventional Downlink Control Information (DCI) field on the Physical Downlink Control Channel (PDCCH).
In 5G NR, the PDCCH carries scheduling and control information from the gNodeB to the UE. DCI formats determine whether the signaling concerns uplink transmission, downlink transmission, or another supported control procedure.
For downlink scheduling, DCI formats 1_0 and 1_1 can specify PDSCH resource assignments, including frequency-domain and time-domain resource allocation.
The DCI also contains a Modulation and Coding Scheme (MCS) field. This identifies the modulation order and target coding rate associated with the scheduled PDSCH transmission.
For uplink scheduling, DCI formats 0_0 and 0_1 can provide PUSCH resource allocations and associated transmission parameters.
PMI serves a different purpose. Based on configured CSI-RS measurements, the UE determines a preferred precoding matrix and reports the associated PMI to the gNodeB.
This feedback is conveyed through applicable uplink reporting procedures using PUCCH or PUSCH.
Therefore, PMI is the only listed parameter that is not ordinarily carried as a PDCCH DCI field.
Official Reference: 3GPP TS 38.212, Section 7.3.1, DCI Formats ; TS 38.214, Section 5.2, Channel State Information Reporting .
NEW QUESTION # 52
Which message is used to provide the LTE frequencies and reselection parameters configured on the 5G side?
Answer: A
Explanation:
System Information Block 5 (SIB5) is the correct answer because it provides information required for inter- Radio Access Technology (inter-RAT) cell reselection from 5G NR to LTE E-UTRA.
When an NR UE operates in RRC_IDLE or RRC_INACTIVE, cell reselection allows it to identify and camp on a more appropriate serving cell according to broadcast network priorities and radio conditions.
The NR network broadcasts the relevant E-UTRA reselection configuration through SIB5.
According to 3GPP TS 38.331, SIB5 contains the carrierFreqListEUTRA information element, identifying LTE carrier frequencies that the UE may evaluate.
It also contains t-ReselectionEUTRA , which determines the applicable inter-RAT reselection timing requirement.
Additional information can include frequency priorities, reselection thresholds, minimum received signal- level requirements, and neighboring-cell restrictions.
These parameters allow the UE to compare candidate LTE cells against the NR serving cell and apply the configured reselection criteria.
The remaining options serve different functions.
SIB3 provides NR intra-frequency cell-reselection information.
SIB4 provides NR inter-frequency cell-reselection information.
SIB6 is not the system information block used to advertise the NR-to-E-UTRA reselection frequency configuration.
Therefore, SIB5 is specifically responsible for supplying the LTE frequencies and associated reselection parameters configured by the NR network.
Official Reference: 3GPP TS 38.331, Section 6.3.1, SIB5 Information Element ; TS 38.304, UE Procedures in Idle Mode and RRC_INACTIVE .
NEW QUESTION # 53
What is the maximum coverage altitude for low-attitude 5G drone scenarios?
Answer: D
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 # 54
Only one codeword is needed when four streams are transmitted over the air interface.
Answer: A
Explanation:
The statement is true because 5G NR supports mapping a single codeword to as many as four spatial transmission layers in the standard downlink spatial-multiplexing configuration.
A codeword represents a sequence of encoded data bits generated through channel coding and associated processing before modulation and layer mapping.
Spatial layers are logical MIMO transmission streams used to transport data across multiple spatial dimensions of the radio channel.
The number of codewords is not necessarily equal to the number of MIMO layers.
According to 3GPP TS 38.211, the PDSCH codeword-to-layer mapping procedure supports one codeword for transmissions using one, two, three, or four layers.
For example, when four layers are scheduled, modulation symbols from the single codeword are distributed across four layers according to the specified mapping procedure.
When the configured downlink transmission uses five to eight spatial layers, two codewords are supported, with the corresponding layer allocation determined by the applicable mapping table.
This distinction is essential when evaluating MIMO transmission rank, transport-block processing, HARQ operation, and channel-coding requirements.
Consequently, a four-layer spatial-multiplexing transmission requires only one codeword under the standardized NR mapping configuration.
Official Reference: 3GPP TS 38.211, Section 7.3.1.3, Table 7.3.1.3-1, Codeword-to-Layer Mapping for Spatial Multiplexing .
NEW QUESTION # 55
A UE can report the following CSI types for CSI-RS measurement. Which of the statements below is incorrect?
Answer: A
Explanation:
Option C is incorrect because the Rank Indicator (RI) identifies the preferred transmission rank, corresponding to the number of spatial layers suitable for MIMO transmission. It does not select an individual optimal layer based on CQI and PMI measurements.
In NR, CSI reporting allows the gNodeB to adapt beamforming, spatial multiplexing, modulation, and coding to the prevailing radio-channel conditions.
The Channel State Information Reference Signal (CSI-RS) provides measurement resources that support these procedures.
CRI (CSI-RS Resource Indicator) identifies the preferred CSI-RS resource. When CSI-RS resources correspond to distinct transmission beams, CRI can indicate the preferred beam.
PMI (Precoding Matrix Indicator) identifies a preferred precoding matrix selected from the configured codebook. This assists the gNodeB in determining suitable spatial transmission weights.
RI (Rank Indicator) specifies the preferred number of MIMO spatial layers, considering the channel's capacity to support simultaneous data streams.
CQI (Channel Quality Indicator) represents the estimated downlink channel quality under the configured reporting assumptions and supports link adaptation.
The distinction is that RI describes transmission rank, not layer identity. In configurations that support a Layer Indicator (LI), LI provides information concerning the strongest layer associated with the reported precoder.
Consequently, option C incorrectly describes the function of RI.
Official Reference: 3GPP TS 38.214, Section 5.2.1, CSI Reporting , including CRI, RI, LI, PMI, and CQI reporting quantities.
NEW QUESTION # 56
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