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| Section | Objectives |
|---|---|
| Topic 1: Troubleshooting and Performance Enhancement | - Performance tuning methods - Fault diagnosis in 5G networks |
| Topic 2: Radio Network Optimization | - KPI analysis and optimization - Interference analysis and mitigation - Mobility optimization |
| Topic 3: 5G Radio Network Fundamentals | - Radio access network basics - 5G NR system architecture and principles |
| Topic 4: Radio Network Planning | - Capacity planning - Coverage planning - Site selection and dimensioning |
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NEW QUESTION # 30
Different TDD slot configurations influence the network's downlink coverage, service rate, and air-interface RTT delay. Therefore, these factors must be considered during planning.
Answer: B
Explanation:
The statement is true because Time Division Duplex (TDD) slot configuration determines the distribution and timing of uplink and downlink transmission opportunities, affecting service capacity, radio performance, and scheduling-related latency.
In 5G NR TDD, a carrier uses different time-domain resources for downlink and uplink communication.
The configured pattern defines downlink slots, uplink slots, and special slots containing a combination of downlink, uplink, or flexible symbols.
A configuration allocating a greater proportion of resources to the downlink generally provides more downlink transmission capacity, assuming comparable radio conditions and scheduling efficiency.
However, reducing uplink opportunities may increase uplink waiting time and affect the timing of uplink control information, HARQ feedback, and associated application transactions.
TDD configuration also influences downlink service performance at cell boundaries.
Although slot configuration does not directly change propagation loss or the fundamental RF link budget, the available downlink time resources can affect the achievable service rate and service-coverage boundary.
Air-interface round-trip time is influenced by the interval between transmission and the corresponding feedback or return-transmission opportunity.
Therefore, TDD planning must balance service-rate requirements, uplink capacity, downlink capacity, synchronization constraints, and latency objectives.
Consequently, the statement correctly identifies TDD slot configuration as a significant planning consideration.
Official Reference: 3GPP TS 38.213, Section 11.1, Slot Configuration ; TS 38.331, TDD-UL-DL- ConfigCommon and TDD-UL-DL-ConfigDedicated .
NEW QUESTION # 31
Which of the following parameters determines the PRACH time-domain position?
Answer: C
NEW QUESTION # 32
Which of the following channels or signals uses the same transmit power as the PUSCH?
Answer: A
Explanation:
In NR, SRS is transmitted by the UE to provide uplink channel-sounding information for scheduling, channel estimation, beam management, and MIMO-related procedures.
The SRS transmission-power calculation follows the uplink power-control principles specified in 3GPP TS
38.213.
These principles include configured target-power parameters, transmission bandwidth, estimated path loss, path-loss compensation, and applicable closed-loop adjustments.
Under certain configurations, SRS may share a power-control adjustment state with PUSCH. Under other configurations, separate adjustment states and SRS-specific parameters are used.
Consequently, SRS transmission power is related to the PUSCH power-control mechanism but is not necessarily numerically identical to PUSCH transmit power .
PRACH has its own random-access transmit-power and power-ramping procedures.
PUCCH uses a separate uplink power-control calculation, while PDSCH is a downlink physical channel.
The intended comparison therefore points toward SRS, represented incorrectly as SRC in the original choices.
Official Reference: 3GPP TS 38.213, Sections 7.1 and 7.3, PUSCH and SRS Transmit Power Control .
Technical warning / qualification: Replace option C, SRC , with SRS . The question should also state uses a related power-control mechanism rather than uses the same transmit power , because the latter is not universally correct.
NEW QUESTION # 33
Which of the following PUCCH measurement counters is used for outer-loop power control on PUCCH?
Answer: C
Explanation:
Block Error Rate (BLER) is the intended answer because outer-loop power-control algorithms use error- performance feedback to adjust the target received signal quality required for reliable control-channel reception.
PUCCH carries essential Uplink Control Information (UCI), including HARQ acknowledgments, scheduling requests, and configured channel-state reports.
Errors in these transmissions can produce unnecessary retransmissions, incorrect scheduling decisions, and reduced radio-network efficiency.
The distinction between inner-loop and outer-loop power control is important.
Inner-loop power control adjusts transmission power according to the difference between measured signal quality, commonly expressed through SINR, and a configured target.
The gNodeB can issue Transmit Power Control (TPC) commands to modify the UE's PUCCH transmit power.
Outer-loop power control adjusts the target signal-quality requirement according to observed error performance. When reception reliability deteriorates, the target SINR can be increased to improve decoding probability. Conversely, consistently satisfactory error performance can permit a reduction in the target.
RSRP measures received reference-signal power, while power spectral density expresses signal or noise power per unit bandwidth. Neither directly represents the error-performance feedback used in the intended outer-loop mechanism.
Therefore, BLER is the expected examination answer, with implementation-specific qualifications.
Official Reference: 3GPP TS 38.213, Section 7.2.1, PUCCH Transmit Power Control .
Technical warning / qualification: 3GPP specifies the PUCCH power-control signaling and calculations but does not mandate one universal BLER-based outer-loop algorithm. Huawei implementations may use BER or another error-performance measure depending on the radio technology and PUCCH configuration.
NEW QUESTION # 34
During downlink data transmission, if a UE suddenly stops reporting CQI, which of the following issues will occur?
Answer: B
Explanation:
CQI is part of the Channel State Information (CSI) reported by the UE to assist the gNodeB in downlink link adaptation.
The CQI value represents the estimated channel quality under configured reporting assumptions and helps determine an appropriate modulation order and coding rate.
When the UE stops reporting CQI, the scheduler loses an important source of updated radio-channel information.
In an implementation that retains the last valid channel-quality estimate, the scheduler may continue transmitting using the previously selected MCS.
However, this is not a universal requirement.
A gNodeB may also use HARQ acknowledgment statistics, observed decoding performance, configured fallback policies, or other available channel information to modify its scheduling decisions.
Consequently, downlink transmission does not necessarily stop, and a low-order MCS is not always selected.
The absence of fresh CQI can adversely affect link-adaptation accuracy and throughput, so option D is also not generally appropriate.
Option C therefore reflects the expected simplified behavior, but its use of the word always makes the statement technically overrestrictive.
Official Reference: 3GPP TS 38.214, Sections 5.1 and 5.2, PDSCH Procedures and CSI Reporting ; TS
38.321, HARQ Operation and MAC Procedures .
Technical warning / qualification: 3GPP does not mandate that an unchanged MCS must always be used after CQI reporting stops. The answer is valid only under a specific scheduler implementation or fallback policy. As written, the question has no universally guaranteed correct option.
NEW QUESTION # 35
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