QUESTION: 5

C-band is the most popular frequency band for 5G network deployment. However, there is an imbalance between uplink and downlink coverage -- how much does this imbalance approximately amount to?

5dB
3dB
12dB
20dB

Answer(s): B

Explanation:

The imbalance between uplink and downlink coverage in C-band is not fixed, it varies depending on the network configuration, location, and other factors. Generally speaking, it's hard to provide an exact number for this imbalance, as it depends on the specific network conditions and the equipment used.
However, a common practice is to use more power in downlink than uplink, this is due to the fact that downlink is more sensitive to path loss than uplink, and also because the downlink signal is intended to cover a larger area than the uplink. Therefore, the imbalance is commonly in the range of 3 to 6 dB, and it's more likely to be at the lower end of that range. So, the correct answer is B. 3dB It's worth noting that the C-band is not the most popular frequency band for 5G network deployment, it's just one of the many frequency bands that are being used for 5G deployment, and the most popular frequency bands for 5G deployment vary depending on the country, region, and operator.

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QUESTION: 6

F-OFDM over the NR air interface uses flexible subcarrier spacing to meet the requirements of different 5G service scenarios.
Which of the following types of subcarrier spacing is not supported by Sub6G?

120KHz
15KHz
60KHZ
30KHz

Answer(s): A

Explanation:

F-OFDM (Filtered Orthogonal Frequency Division Multiplexing) over the NR air interface uses flexible subcarrier spacing to meet the requirements of different 5G service scenarios. F-OFDM is a 5G physical layer waveform that is designed to provide high spectral efficiency, low complexity and low latency. It uses a flexible subcarrier spacing, which can be adjusted to meet the requirements of different 5G services. The subcarrier spacing can be 15KHz, 30KHz, 60KHz, or 120KHz. Sub-6GHz 5G networks are designed to provide wide-area coverage and support high data rate services such as mobile broadband, IoT, and critical communications. Sub-6GHz band is mainly used for 5G deployment in rural areas, and in-building coverage.

Therefore, the subcarrier spacing that is not supported by Sub-6GHz is 120KHz. So the correct answer is A. 120KHz. It's worth noting that each subcarrier spacing has its own advantages and disadvantages. 120KHz spacing is mainly used for low mobility services such as fixed wireless access, while 15KHz spacing is mainly used for high mobility services such as mobile broadband.

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QUESTION: 7

The mmWave range is new for NR. It supports the largest bandwidth in a cell but has poor coverage capabilities. It requires high performance from RF components and generally applies only to line of sight (LOS) coverage.

True
False

Answer(s): A

Explanation:

The mmWave range is a new spectrum range for 5G NR, and it supports the largest bandwidth in a cell. However, it has poor coverage capabilities, as it requires high performance from RF components and generally applies only to line of sight (LOS) coverage. This makes it challenging to use in many applications, as it requires careful planning and implementation in order to ensure effective coverage.
https://www.gsma.com/futurenetworks/wiki/5g-implementation-guidelines/ 5G Implementation Guidelines: NSA Option 3 - Future Networks https://www.gsma.com/futurenetworks/wiki/5g-implementation-guidelines/ https://www.ericsson.com/en/ran
5G RAN - Radio Access Networks - Ericsson https://www.ericsson.com/en/ran https://www.5gamericas.org/wp-content/uploads/2020/12/InDesign-Understanding-mmWave-for- 5G-Networks.pdf
Understanding mmWave for 5G Networks 1 - 5G Americas https://www.5gamericas.org/wp-content/uploads/2020/12/InDesign-Understanding-mmWave-for- 5G-Networks.pdf

The millimeter wave (mmWave) range is new for 5G NR (New Radio). It supports the largest bandwidth in a cell but has poor coverage capabilities. It requires high performance from RF

components and generally applies only to line of sight (LOS) coverage. The mmWave range is considered to be the higher frequency range of the 5G spectrum and it includes frequencies above 24GHz, such as 28GHz, 38GHz and 60GHz. These frequencies offer a large amount of bandwidth, which is necessary to support high-data rate services, such as ultra-high- definition video streaming, virtual reality, and the internet of things. However, the mmWave range has poor coverage capabilities because the signals are easily blocked by obstacles such as buildings and trees, and they also have a shorter propagation distance than lower frequency bands. Therefore, mmWave range is generally used for high-density urban areas, and indoor environments.
Additionally, RF components for mmWave have to meet high performance requirements, such as high linearity, high gain and high power handling capability. Also, the mmWave signals are highly sensitive to the presence or absence of a clear line of sight (LOS) between the transmitter and the receiver, which makes it less reliable for non-line-of-sight (NLOS) coverage.

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QUESTION: 8

Which of the following statements about the NR slot structure are correct? (Choose All that Apply)

Downlink slots can only be used to transmit downlink data.
Downlink self-contained slots can be used to transmit uplink data and SRSs.
The number of symbols in one slot is fixed to 14 regardless of the subcarrier spacing configuration.
The symbols in a slot can be classified as downlink, uplink, or flexible.

Answer(s): A,B,D

Explanation:

1. NR downlink slots are used to transmit downlink data and control information, such as channel state information (CSI) and downlink control information (DCI). B. Downlink self-contained slots are also called as "Downlink Shared Channels (DL-SCH) slots", they can be used to transmit downlink data, but also can be used to transmit uplink control information (UCI) and sounding reference signals (SRS) in the downlink direction.
2. The symbols in a slot can be classified as downlink, uplink, or flexible, meaning that the symbols can be used to transmit data in either direction, or to transmit control information. It's worth noting that the NR slot structure is designed to be flexible and efficient, it allows for a variable slot duration and a variable number of symbols, depending on the subcarrier spacing and the number of resource blocks used. This flexibility is intended to support a wide range of services and traffic types.

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