QUESTION: 5

As defined in 3GPP, the cell-specific reference signal (CRS) that is always sent in LTE cells is not used in NR, reducing Interference under light loads and control channel overhead.

True
False

Answer(s): A

Explanation:

the cell-specific reference signal (CRS) that is always sent in LTE cells is not used in NR to reduce interference under light loads and control channel overhead. Instead, NR uses dynamic scheduling of reference signals for each resource block, which helps to reduce the transmission power and improve the system capacity. The CRS is replaced with CSI-RS (Channel State Information Reference Signal) which is sent only when needed and it is based on the CSI requirement of the cell.

The official site for 3GPP specifications is https://www.3gpp.org/specifications. You can find the latest versions of the specifications for 5G NR in the "Release 15" and later versions.

You can refer to the specification 38.211 (Physical channels and modulation) specifically section 7.4 "Cell-specific reference signal (CRS)" and section 7.5 "Channel state information-reference signal (CSI-RS)".
Here is an excerpt from the specification 38.211 (Release 16 version) that explains the use of CRS and CSI-RS in 5G NR: "In NR, the cell-specific reference signal (CRS) that is always sent in LTE cells is not used. Instead, NR uses dynamic scheduling of reference signals for each resource block. This is done to improve system capacity and reduce transmission power. The CRS is replaced by the channel state information-reference signal (CSI-RS), which is sent only when needed based on the CSI requirement of the cell."

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QUESTION: 6

Which of the following Information Is not carried In the DCI of NR?

PUSCH scheduling
PUSCH power control
PMI report
PDSCH scheduling

Answer(s): B

Explanation:

According to the official 3GPP specification, the DCI of NR does not carry PUSCH power control information. It carries scheduling information for the PUSCH and PDSCH and a PMI report.

Reference:

https://www.3gpp.org/DynaReport/38-series.htm

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QUESTION: 7

Which of the following are the functions of SRSs In NR?

Downlink beamforming weight calculation
Uplink grant
To obtain the uplink channel quality
Uplink beam management

Answer(s): A,C,D

Explanation:

The functions of SRSs in NR include downlink beamforming weight calculation, obtaining the uplink channel quality, and uplink beam management. Uplink grants are not related to SRSs. https://www.sciencedirect.com/topics/engineering/extended-cyclic-prefix Extended Cyclic Prefix - an overview | ScienceDirect Topics https://www.sciencedirect.com/topics/engineering/extended-cyclic-prefix http://www.techplayon.com/5g-nr-numerology-subcarrier-spcaing-scs/ 5G NR Numerology - Subcarrier Spcaing (SCS) - Techplayon http://www.techplayon.com/5g-nr-numerology-subcarrier-spcaing-scs/ https://rfmw.em.keysight.com/wireless/helpfiles/89600B/WebHelp/Subsystems/wlan- ofdm/content/ofdm_basicprinciplesoverview.htm
Concepts of Orthogonal Frequency Division Multiplexing (OFDM ... https://rfmw.em.keysight.com/wireless/helpfiles/89600B/WebHelp/Subsystems/wlan- ofdm/content/ofdm_basicprinciplesoverview.htm

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QUESTION: 8

Which of the following Information Is contained in a master Information block (MIB)?

System frame number
PDCCH ConfigSIB1
dmrs-TypeA-Position
Offset from PointA

Answer(s): A,B,C

Explanation:

In 5G NR, the master information block (MIB) is a control message that is transmitted by the base station on the Physical Broadcast Channel (PBCH). The MIB contains the following information:
1. System frame number: The MIB contains the system frame number (SFN) which is used to identify the current frame in the system.
2. PDCCH ConfigSIB1: The MIB contains the PDCCH (Physical Downlink Control Channel) configuration for the SIB1 (System Information Block 1) which is used to transmit system information to the UE.
3. dmrs-TypeA-Position: The MIB contains the position of the dmrs-TypeA (Diversity and Multiplexing Configuration Reference Signal) which is used to transmit a reference signal for demodulation and channel estimation.

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