LTTS - 4G & 5G LTENR RAN Engineering Training Program_Week2 - Quiz

LTTS_4G & 5G LTE/NR RAN Engineering_Week2

The number of attempts remaining is 1

1 / 30

1. What target BLER (Block Error Rate) is typically maintained by Adaptive Modulation and Coding (AMC)?

a. 0%

b. ≈ 50%

c. ≈ 10%

d. ≈ 1%

2 / 30

2. What is the bit capacity of a single 64-QAM modulation symbol?

a. 6 bits

b. 10 bits

c. 8 bits

d. 4 bits

3 / 30

3. What is the cyclic prefix duration requirement in standard LTE/5G subcarrier spacing (15 kHz)?

a. ≈ 66.7 μs

b. ≈ 16.7 μs

c. ≈ 9.4 μs

d. ≈ 4.7 μs

4 / 30

4. In 5G NR Frequency Range 2 (FR2), what is the maximum supported channel bandwidth per component carrier?

a. 800 MHz

b. 200 MHz

c. 100 MHz

d. 400 MHz

5 / 30

5. In 5G NR, which physical channel is transmitted without explicit scheduling by the gNB?

a. PUCCH

b. PRACH

c. PDSCH

d. PUSCH

6 / 30

6. Which 3GPP document covers 5G NR physical layer multiplexing and channel coding?

a. TS 38.214

b. TS 38.211

c. TS 38.212

d. TS 38.201

7 / 30

7. How many subcarriers are in a single 5G NR Resource Block (RB)?

a. 6

b. 12

c. 48

d. 24

8 / 30

8. What sequence is used for the Primary Synchronization Signal (PSS) in LTE and 5G NR?

a. Gold Sequence

b. M-sequence

c. Zadoff-Chu Sequence

d. Barker Code

9 / 30

9. What is the maximum number of OFDM symbols in a standard 5G NR slot using a normal cyclic prefix?

a. 14

b. 6

c. 12

d. 7

10 / 30

10. In 5G NR Frequency Range 1 (FR1), what is the maximum supported channel bandwidth?

a. 20 MHz

b. 100 MHz

c. 400 MHz

d. 50 MHz

11 / 30

11. Which physical channel carries the Master Information Block (MIB) in LTE?

a. PBCH

b. PDCCH

c. PDSCH

d. PCFICH

12 / 30

12. In 5G NR, what is the subcarrier spacing (SCS) for numerology μ = 3?

a. 240 kHz

b. 30 kHz

c. 60 kHz

d. 120 kHz

13 / 30

13. Which physical channel informs the UE about the number of OFDM symbols used for the control region in an LTE subframe?

a. PDSCH

b. PDCCH

c. PHICH

d. PCFICH

14 / 30

14. What modulation scheme carries 2 bits per symbol?

a. 16-QAM

b. BPSK

c. QPSK

d. 64-QAM

15 / 30

15. Which reference signal in LTE is used by the UE for downlink channel estimation and coherent demodulation?

a. CSI-RS

b. SRS

c. DM-RS

d. CRS

16 / 30

16. What is the purpose of Gray mapping on modulation constellations?

a. It ensures adjacent constellation points differ by only one bit

b. It reduces peak-to-average power ratio (PAPR)

c. It eliminates inter-symbol interference (ISI)

d. It doubles the overall symbol transmission speed

17 / 30

17. Which physical channel carries Downlink Control Information (DCI) in 5G NR?

a. PDCCH

b. PBCH

c. PDSCH

d. PUCCH

18 / 30

18. What is the duration of a standard LTE radio frame?

a. 1 ms

b. 0.5 ms

c. 10 ms

d. 5 ms

19 / 30

19. Which 3GPP specification defines LTE physical channels and modulation?

a. TS 36.211

b. TS 36.213

c. TS 36.201

d. TS 36.212

20 / 30

20. Which coding scheme is used to protect control channels (e.g., PDCCH, PBCH) in 5G NR?

a. LDPC Coding

b. Polar Coding

c. Reed-Solomon Coding

d. Turbo Coding

21 / 30

21. How many resource elements (REs) make up one standard LTE Resource Block (RB) spanning one slot?

a. 72

b. 168

c. 12

d. 84

22 / 30

22. Which signal is used for the Secondary Synchronization Signal (SSS) in 5G NR?

a. m-sequence

b. Kasami Sequence

c. Hadamard Code

d. Zadoff-Chu Sequence

23 / 30

23. In 5G NR, which LDPC Base Graph is selected for a transport block size (TBS) K ≤ 3824 bits?

a. Base Graph 4 (BG4)

b. Base Graph 3 (BG3)

c. Base Graph 1 (BG1)

d. Base Graph 2 (BG2)

24 / 30

24. How many subframes are contained within one LTE radio frame?

a. 5

b. 14

c. 20

d. 10

25 / 30

25. What sequence structure is used to generate LTE and 5G NR PRACH preambles?

a. Zadoff-Chu Sequence

b. Kasami Sequence

c. Gold Sequence

d. Hadamard Sequence

26 / 30

26. Which channel coding scheme protects PDSCH user data in 5G NR?

a. LDPC Coding

b. Turbo Coding

c. Polar Coding

d. Convolutional Coding

27 / 30

27. Why is SC-FDMA (DFT-s-OFDM) primarily utilized for LTE and 5G NR uplink transmissions?

a. It enables non-contiguous resource allocations

b. It has lower PAPR to preserve UE battery power

c. It offers higher peak data rates than CP-OFDM

d. It eliminates the need for a cyclic prefix

28 / 30

28. Which LTE 3GPP specification governs physical layer measurement definitions such as RSRP and RSRQ?

a. TS 36.213

b. TS 36.212

c. TS 36.214

d. TS 36.211

29 / 30

29. What is the subcarrier spacing (SCS) for numerology μ = 0 in 5G NR?

a. 15 kHz

b. 60 kHz

c. 30 kHz

d. 120 kHz

30 / 30

30. Which reference signal is configured in 5G NR specifically to compensate for phase noise at high frequencies (FR2 mmWave)?

a. SRS

b. PT-RS

c. DM-RS

d. CSI-RS

Your score is