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| Section | Weight | Objectives |
|---|---|---|
| 5G Wireless Network Principles | 20% | - 5G NR Frame Structure and Physical Resources - 5G NR Mobility and Power Control - 5G NR Overview and Key Technologies - 5G NR Channels and Signals |
| Basic Features of 5G Wireless Networks | 20% | - 5G QoS and Slicing - Beam Management and Optimization - Massive MIMO Technology - Flexible Duplex and Spectrum Sharing |
| Fundamentals of 5G Network Planning | 20% | - Parameter Planning and Configuration - Capacity and Interference Planning - Wireless Environment Analysis and Coverage Planning - 5G Network Planning Process and Principles - Site Survey and Design |
| Fundamentals of 5G Network Optimization | 30% | - Coverage Optimization - Performance Monitoring and Evaluation Indicators - Network Optimization Process and Methods - Mobility Optimization - Interference Optimization - Capacity and Throughput Optimization |
| 5G Base Station Overview and Basic Operations | 10% | - 5G Base Station Products and Hardware Composition - 5G Base Station Installation and Deployment - 5G Base Station Configuration and Commissioning - 5G Base Station Maintenance and Fault Handling |
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49. Frage
How many RBs are included when a bandwidth of 100 MHz and a subcarrier spacing of 60 kHz are used in a
5G cell?
Antwort: D
Begründung:
Explanation
To find the number of RBs in a 5G cell, we need to know the bandwidth and the subcarrier spacing of the cell.
The bandwidth is the total frequency range allocated for the cell, while the subcarrier spacing is the frequency separation between adjacent subcarriers in the cell. A RB is a group of 12 consecutive subcarriers in the frequency domain 12. Therefore, the number of RBs in a 5G cell can be calculated by dividing the bandwidth by the product of the subcarrier spacing and 12.
Given that the bandwidth is 100 MHz and the subcarrier spacing is 60 kHz, we can use the following formula to find the number of RBs:
Number of RBs = Bandwidth / (Subcarrier spacing * 12) Number of RBs = 100 MHz / (60 kHz * 12) Number of RBs = 100000 kHz / 720 kHz Number of RBs = 138.888...
However, since the number of RBs must be an integer, we need to round it down to the nearest multiple of
3 3. This is because the NR standard defines different frequency ranges for different subcarrier spacings, and each frequency range has a minimum and maximum number of RBs that are multiples of 3 4. For example, for subcarrier spacing of 60 kHz, the frequency range is from 24250.08 MHz to 52600.08 MHz, and the minimum and maximum number of RBs are 66 and 273, respectively.
Therefore, the closest multiple of 3 to 138.888... is 135. However, this number is not valid because it is lower than the minimum number of RBs for subcarrier spacing of 60 kHz. The next valid multiple of 3 is 273, which is also the maximum number of RBs for subcarrier spacing of 60 kHz. Therefore, the correct answer is C. 273.
50. Frage
In downlink peak rate testing, the modulation and coding scheme (MCS) index must reach 32.
Antwort: B
Begründung:
Explanation
According to the HCIA-5G V2.0 Exam Outline, in downlink peak rate testing, the modulation and coding scheme (MCS) index must reach 32, which corresponds to option A.
51. Frage
For the N78 frequency band, which of the following time slot ratios (downlink, uplink) can support the transmission of SSB beams?
Antwort: B
Begründung:
The 7:3 DL:UL slot ratio provides sufficient downlink resources and timing alignment to support SSB beam transmission requirements in the n78 band.
52. Frage
Which of the following statements about Huawei AAUs are correct?(Select All that Apply)
Antwort: A,B,D
Begründung:
Explanation
According to the Huawei's Latest AAU Products, Huawei's AAUs have an operating voltage of -48 V DC and support LTE-NR dual-mode on some frequency bands, such as C-band and sub-3 GHz bands. The article also states that Huawei's new-generation 64T64R AAUs provide higher coverage gains than conventional 32T32R AAUs by using ELAA (extremely large antenna array) technology. Huawei's AAUs do not support GSM-NR dual-mode on any frequency band, as GSM is not a compatible RAT with NR.
53. Frage
Which of the following statements about the advantages of the Rayce ray tracing model are correct?(Select All that Apply)
Antwort: A,D
Begründung:
Explanation
The Rayce ray tracing model is a propagation model that computes propagation paths using 3-D environment geometry 3. It is based on the shooting and bouncing rays (SBR) method, which launches rays from the transmitter and traces their reflections and diffractions until they reach the receiver or are attenuated below a threshold 4. The Rayce ray tracing model offers more accurate path searching, reflection, and diffraction energy calculation for electromagnetic wave propagation than other models, such as empirical models or deterministic models 5. It also offers higher level prediction accuracy, especially for massive MIMO systems that use beamforming techniques 6. The Rayce ray tracing model is not applicable only to C-band, but also to mmWave and other frequency bands 7.
54. Frage
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