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| Section | Weight | Objectives |
|---|---|---|
| 5G Network Planning and Design | 30% | - Capacity Planning
|
| 5G Radio Network Planning Fundamentals | 20% | - 5G Network Architecture and Interfaces
|
| 5G Network Optimization | 35% | - Performance Analysis
|
| 5G Network Testing and Troubleshooting | 15% | - Testing Methods
|
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17. Frage
If a cell covers a high-speed railway on which UEs travel at 250 km/h, which PRACH format should be selected for that cell?
Antwort: A
Begründung:
PRACH Format 3 is the intended selection because its 5 kHz subcarrier spacing provides greater tolerance to Doppler shift than the 1.25 kHz spacing associated with the other listed long-preamble formats.
The Physical Random Access Channel (PRACH) is used by the UE to initiate random-access procedures, including initial access and applicable mobility-related synchronization procedures.
In high-speed railway environments, rapidly moving UEs experience significant Doppler frequency shifts due to their motion relative to the serving base station.
Doppler shift is approximately proportional to carrier frequency and radial velocity.
At a UE speed of 250 km/h, the Doppler frequency can become sufficiently large to impair correlation and detection performance when narrow PRACH subcarrier spacing is used.
According to the standardized PRACH configurations, Formats 0, 1, and 2 use 1.25 kHz subcarrier spacing, while Format 3 uses 5 kHz.
The wider spacing reduces the relative frequency-offset sensitivity of the random-access preamble, helping improve detection reliability in high-mobility conditions.
PRACH planning must also account for maximum cell radius, propagation delay, cyclic prefix, and configured random-access occasions.
For the listed long-preamble formats and the stated high-speed scenario, Format 3 is therefore the preferred answer.
Official Reference: 3GPP TS 38.211, Section 6.3.3, Physical Random Access Channel ; TS 38.101-1, Section 6.3.3.4, Table 6.3.3.4-1, PRACH ON Power Measurement Period .
18. Frage
Which physical channel is used to transmit ACK/NACK for 5G uplink data?
Antwort: A
Begründung:
The Physical Downlink Control Channel (PDCCH) is the closest applicable choice for the HARQ control mechanism associated with 5G NR uplink data transmissions.
In NR, uplink user data is transmitted through PUSCH. The gNodeB receives and decodes the transmitted transport block and determines whether retransmission is necessary.
Unlike LTE, NR does not define the Physical Hybrid ARQ Indicator Channel (PHICH) for explicit acknowledgment of uplink transmissions.
Instead, NR employs asynchronous uplink HARQ operation controlled through scheduling information provided by the gNodeB.
The PDCCH carries Downlink Control Information (DCI), including uplink grants specifying the HARQ process identifier, New Data Indicator (NDI), and redundancy version.
When retransmission is required, the gNodeB can schedule the corresponding HARQ process again without toggling its NDI.
When new data is scheduled for the same process, the NDI toggles, allowing the UE to distinguish new transmission from retransmission.
PUCCH , by contrast, carries HARQ-ACK feedback transmitted by the UE for downlink PDSCH reception.
It does not carry acknowledgment information from the gNodeB for uplink PUSCH reception.
Therefore, PDCCH is the closest answer, but it carries uplink HARQ scheduling instructions rather than an explicit standalone ACK/NACK indication.
Official Reference: 3GPP TS 38.321, Sections 5.4.1-5.4.2, UL Grant Reception and HARQ Operation ; TS
38.212, Section 7.3.1, DCI Formats .
Technical warning / qualification: The document's explanation selects PUCCH, but this confuses feedback transmitted on the uplink for downlink data with feedback concerning uplink data . A technically correct version should ask: Which physical channel carries DCI used to control HARQ retransmissions for 5G NR uplink data? The answer would then be C.
19. Frage
What is the broadcast periodicity of the MIB in 5G?
Antwort: C
Begründung:
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 .
20. Frage
For NR coverage optimization, the principle is to preferentially optimize SS-SINR and then SS-RSRP.
Antwort: B
Begründung:
Synchronization Signal Reference Signal Received Power (SS-RSRP) measures the received power of the synchronization-signal reference elements and is a fundamental indicator of NR radio coverage.
SS-RSRP optimization establishes whether the received serving-cell signal is sufficiently strong throughout the required coverage area.
Typical corrective actions include adjusting antenna azimuth, electrical downtilt, antenna height, reference- signal transmission characteristics, and site configuration.
Once acceptable signal-strength coverage has been established, the optimization process evaluates signal quality.
Synchronization Signal Signal-to-Interference-plus-Noise Ratio (SS-SINR) measures the synchronization- signal power relative to interference and noise.
Poor SS-SINR can occur even when SS-RSRP is strong, particularly in areas affected by overlapping cell coverage, excessive interference, or unsuitable beam configurations.
Interference coordination, antenna-pattern optimization, and mobility-parameter adjustments may improve SS- SINR and subsequent service performance.
The two measurements must ultimately be considered together because strong signal power does not guarantee acceptable radio quality.
However, the statement reverses the intended priority by placing SS-SINR before SS-RSRP.
Therefore, option B is correct.
Official Reference: 3GPP TS 38.215, Physical Layer Measurements ; TS 28.100, Annex A.1.3, Coverage Optimization Requirements and Measurements .
Technical warning / qualification: The sequence is a planning and optimization guideline, not an absolute
3GPP-mandated workflow. In an interference-limited network, SS-SINR may require immediate attention even when SS-RSRP is adequate.
21. Frage
How many consecutive symbols does each SSB occupy in the time domain?
Antwort: B
Begründung:
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.
22. Frage
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