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| Section | Objectives |
|---|---|
| Troubleshooting and Performance Enhancement | - Performance tuning methods - Fault diagnosis in 5G networks |
| Radio Network Planning | - Site selection and dimensioning - Coverage planning - Capacity planning |
| Radio Network Optimization | - Mobility optimization - KPI analysis and optimization - Interference analysis and mitigation |
| 5G Radio Network Fundamentals | - 5G NR system architecture and principles - Radio access network basics |
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質問 # 22
Which of the following options cannot be used to address weak coverage issues?
正解：B
解説：
Adjusting neighbor relationships is the intended incorrect coverage-optimization method because neighbor configuration primarily controls mobility procedures rather than the physical radio-signal conditions that determine coverage.
Weak coverage occurs when the received signal level or effective link budget is insufficient to maintain the required radio connection and service quality.
Coverage optimization generally focuses on antenna configuration, transmit power, receiver sensitivity, propagation conditions, and interference management.
A Tower Mounted Amplifier (TMA), where supported by the equipment architecture, can improve uplink receiver performance by reducing the effective receive-system noise figure and compensating for feeder- related losses.
Antenna optimization can improve the geographical distribution of radio energy by adjusting azimuth, electrical or mechanical downtilt, antenna height, and antenna gain.
Increasing gNodeB downlink transmit power may improve received reference-signal strength, provided regulatory limits, interference considerations, and equipment constraints are respected.
Neighbor relationships serve a different function.
They identify neighboring cells that may participate in measurements, handovers, and other mobility procedures.
Changing a neighbor relationship does not directly improve propagation loss, received signal strength, or the physical coverage footprint.
Although neighbor optimization can resolve mobility failures that appear to users as coverage problems, it cannot independently correct an RF link-budget deficiency.
Therefore, option A is correct.
Official Reference: 3GPP TS 38.300, Overall Description of NR and NG-RAN , mobility-management principles; TS 38.133, Requirements for Support of Radio Resource Management . The specific RF- optimization distinction follows radio-planning principles rather than a vendor-mandated procedure.
質問 # 23
For the formula used to calculate PUSCH power during initial access, which statement about path loss (PL) is correct?
正解：B
解説：
Who estimates it?
* The UE estimates the path loss ( ), not the gNodeB.
Uplink vs. Downlink:
* Because the UE does not know the uplink channel path loss directly prior to transmitting, it utilizes the channel reciprocity principle (or assumes average path loss symmetry).
* The UE calculates the downlink path loss ( ) by taking the difference between the transmitted reference signal power broadcasted by the network (ss-PBCH-BlockPower or CSI-RS power) and the measured received power (higher-layer filtered RSRP):
Usage:
* This estimated downlink path loss is then inserted into the open-loop power control formula to calculate the required uplink transmit power for PUSCH (including Msg3 during initial access).
質問 # 24
To achieve the 5G downlink single-user peak rate, what must the number of downlink grants be? (The slot configuration is 4:1 and the subcarrier spacing is 30 kHz.)
正解：A
解説：
The expected answer is 1,600 downlink grants per second, based on the numerical assumptions used in the supplied 5G peak-rate calculation.
In 5G NR, subcarrier spacing determines the slot duration. For a normal cyclic prefix, the number of slots per millisecond is:
N_slots/ms = 2