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| Section | Weight | Objectives |
|---|---|---|
| 5G RAN Feature Application | 35% | - Carrier aggregation and dual connectivity - Power control and load balancing - Energy saving and coverage enhancement features - Mobility management and handover optimization |
| 5G Industry Applications & Private Network Solutions | 5% | - Vertical industry scenarios and KPI requirements - Private 5G network requirements and design |
| 5G Radio Network Planning | 10% | - Link budget calculation - Coverage and capacity planning - Interference analysis and mitigation - Parameter planning and configuration |
| 5G Radio Network In-depth Principles | 30% | - 5G spectrum and frame structure - 5G NR protocol stack and signaling procedures - 5G NR air interface fundamentals - Massive MIMO and beamforming principles |
| 5G Radio Network Optimization | 20% | - Performance indicator analysis - Fault diagnosis and troubleshooting - Coverage, capacity, and quality optimization - Drive test and signaling tracing |
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NEW QUESTION # 24
How many consecutive symbols does each SSB occupy in the time domain?
Answer: B
Explanation:
Each Synchronization Signal and Physical Broadcast Channel Block (SSB), formally identified as an SS
/PBCH block, occupies four consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain.
In 5G NR, the SSB provides essential information for initial cell search, synchronization, physical cell identity detection, and acquisition of broadcast system information.
According to 3GPP TS 38.211, Section 7.4.3.1, an SS/PBCH block occupies four consecutive OFDM symbols, numbered 0 through 3.
The SSB contains the Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), Physical Broadcast Channel (PBCH), and associated PBCH Demodulation Reference Signals (DM-RS).
The PSS enables the UE to detect a component of the physical cell identity and establish initial timing synchronization.
The SSS provides the remaining information required to determine the complete physical cell identity and assists synchronization.
The PBCH carries the Master Information Block (MIB), which provides essential configuration information for acquiring further system information.
In the frequency domain, each SSB spans 240 contiguous subcarriers.
Although multiple SSBs may be transmitted within an SSB burst set to support beam sweeping, the time- domain duration of an individual SSB remains exactly four consecutive OFDM symbols.
Official Reference: 3GPP TS 38.211, Section 7.4.3.1, Time-Frequency Structure of an SS/PBCH Block , Table 7.4.3.1-1.
NEW QUESTION # 25
Which of the following MCS indices is required for 256QAM scheduling in downlink peak-rate testing?
Answer: C
Explanation:
MCS index 27 is the expected answer because it represents the highest non-reserved spectral-efficiency entry in the conventional NR PDSCH MCS table supporting 256QAM.
The Modulation and Coding Scheme (MCS) determines the modulation order and target coding rate used for scheduled data transmission.
For 256QAM, the modulation order is Q_m=8, meaning eight coded bits are mapped to each modulation symbol.
According to 3GPP TS 38.214, Table 5.1.3.1-2, MCS index 27 uses modulation order 8 and a target coding- rate parameter of 948/1024.
Its spectral efficiency is approximately 7.4063 bits per resource element before applicable resource overheads.
This makes index 27 particularly relevant when evaluating maximum downlink throughput under favorable radio conditions.
However, an important distinction exists between enabling 256QAM and achieving maximum spectral efficiency.
MCS index 23 also uses 256QAM, with a target coding-rate parameter of 797/1024 and a lower spectral efficiency of approximately 6.2266.
Therefore, both indices 23 and 27 can represent 256QAM modulation, but index 27 provides the higher nominal spectral efficiency.
MCS index 28 is reserved in the referenced table, while index 32 is outside the five-bit MCS index range.
Consequently, B is correct for maximum peak-rate testing.
Official Reference: 3GPP TS 38.214, Section 5.1.3.1, Table 5.1.3.1-2, MCS Index Table 2 for PDSCH .
Technical warning / qualification: Option D also represents 256QAM. The question is unambiguous only if peak-rate testing means selecting the highest non-reserved spectral-efficiency entry. The wording should explicitly state this condition.
NEW QUESTION # 26
A UE can report the following CSI types for CSI-RS measurement. Which of the statements below is incorrect?
Answer: D
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 # 27
In NSA networking, which procedure is initiated by a UE when a 5G cell change fails?
Answer: A
Explanation:
The Secondary Cell Group (SCG) failure information procedure is initiated when a UE detects a qualifying failure associated with its NR secondary connection during Non-Standalone (NSA) operation.
In E-UTRA-NR Dual Connectivity (EN-DC), the LTE eNodeB functions as the Master Node, while the NR gNodeB provides secondary radio connectivity.
The NR Primary Secondary Cell (PSCell) serves as the principal serving cell within the SCG.
When a PSCell change fails, the UE may detect an SCG reconfiguration-with-synchronization failure or another relevant SCG failure condition.
Rather than immediately reestablishing the entire LTE master connection, the UE can report the SCG failure to the Master Node.
For EN-DC, the applicable reporting mechanism involves the SCGFailureInformationNR message transported using LTE RRC signaling.
The failure report can identify the failure type and provide available NR measurement information to assist diagnosis and recovery.
The Master Node may subsequently initiate SCG release, modification, or another appropriate recovery procedure.
Options A and B describe connection-establishment or reestablishment procedures rather than the specific reporting action required for an SCG failure.
Option C, MR, represents measurement reporting and is not the dedicated SCG failure notification mechanism.
Therefore, option D is correct.
Official Reference: 3GPP TS 36.331, Section 5.6.13a, NR SCG Failure Information ; TS 38.331, Section
5.7.3, SCG Failure Information .
Technical warning / qualification: The original options use RPC instead of the standardized abbreviation RRC . The wording has been preserved, but options A and B should be corrected before publication.
NEW QUESTION # 28
Which of the following modules assigns QFIs during PDU session establishment?
Answer: A
Explanation:
The Session Management Function (SMF) is responsible for controlling QoS flows within a PDU session and allocating the associated QoS Flow Identifiers (QFIs).
In the 5G QoS architecture, a QoS flow is the smallest unit of QoS differentiation within a PDU session.
Each QoS flow is identified by a QFI, which is unique within the scope of that PDU session.
The SMF manages the establishment, modification, and release of QoS flows according to subscription information, policy decisions, and service requirements.
During PDU session establishment, the SMF determines the applicable QoS configuration and provides QoS- related information to the User Equipment (UE), access network, and User Plane Function (UPF).
The assigned QFI allows packets belonging to the same QoS flow to receive the appropriate forwarding treatment.
The UPF applies packet detection, forwarding, and QoS enforcement rules supplied through session management procedures, but it does not serve as the principal QFI allocation function.
The AMF manages access and mobility signaling and transports relevant session-management signaling between the UE and SMF.
The UDM supplies subscription and user-related data.
Although QFIs may be dynamically assigned or derived from standardized QoS identifiers in applicable configurations, QoS-flow control remains an SMF responsibility.
Therefore, option B is correct.
Official Reference: 3GPP TS 23.501, Sections 5.7.1.1 and 6.2.2, QoS Flow and Session Management Function .
NEW QUESTION # 29
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