LTTS – 4G & 5G LTENR RAN Engineering Training Program_Week2 LTTS_4G & 5G LTE/NR RAN Engineering_Week2 The number of attempts remaining is 1 1 / 30 1. What is the bit capacity of a single 64-QAM modulation symbol? a. 8 bits b. 4 bits c. 6 bits d. 10 bits 2 / 30 2. What target BLER (Block Error Rate) is typically maintained by Adaptive Modulation and Coding (AMC)? a. ≈ 10% b. ≈ 50% c. ≈ 1% d. 0% 3 / 30 3. 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 1 (BG1) c. Base Graph 2 (BG2) d. Base Graph 3 (BG3) 4 / 30 4. In 5G NR, what is the subcarrier spacing (SCS) for numerology μ = 3? a. 60 kHz b. 30 kHz c. 240 kHz d. 120 kHz 5 / 30 5. In 5G NR Frequency Range 2 (FR2), what is the maximum supported channel bandwidth per component carrier? a. 200 MHz b. 800 MHz c. 100 MHz d. 400 MHz 6 / 30 6. 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 7 / 30 7. Which LTE 3GPP specification governs physical layer measurement definitions such as RSRP and RSRQ? a. TS 36.211 b. TS 36.214 c. TS 36.212 d. TS 36.213 8 / 30 8. What is the cyclic prefix duration requirement in standard LTE/5G subcarrier spacing (15 kHz)? a. ≈ 4.7 μs b. ≈ 66.7 μs c. ≈ 16.7 μs d. ≈ 9.4 μs 9 / 30 9. Which reference signal in LTE is used by the UE for downlink channel estimation and coherent demodulation? a. CRS b. DM-RS c. CSI-RS d. SRS 10 / 30 10. What sequence structure is used to generate LTE and 5G NR PRACH preambles? a. Gold Sequence b. Kasami Sequence c. Zadoff-Chu Sequence d. Hadamard Sequence 11 / 30 11. Which 3GPP specification defines LTE physical channels and modulation? a. TS 36.211 b. TS 36.201 c. TS 36.213 d. TS 36.212 12 / 30 12. Which reference signal is configured in 5G NR specifically to compensate for phase noise at high frequencies (FR2 mmWave)? a. DM-RS b. SRS c. PT-RS d. CSI-RS 13 / 30 13. In 5G NR Frequency Range 1 (FR1), what is the maximum supported channel bandwidth? a. 100 MHz b. 20 MHz c. 50 MHz d. 400 MHz 14 / 30 14. Which channel coding scheme protects PDSCH user data in 5G NR? a. Turbo Coding b. Polar Coding c. Convolutional Coding d. LDPC Coding 15 / 30 15. In 5G NR, which physical channel is transmitted without explicit scheduling by the gNB? a. PUCCH b. PDSCH c. PUSCH d. PRACH 16 / 30 16. How many subframes are contained within one LTE radio frame? a. 14 b. 20 c. 10 d. 5 17 / 30 17. What is the purpose of Gray mapping on modulation constellations? a. It reduces peak-to-average power ratio (PAPR) b. It doubles the overall symbol transmission speed c. It ensures adjacent constellation points differ by only one bit d. It eliminates inter-symbol interference (ISI) 18 / 30 18. How many resource elements (REs) make up one standard LTE Resource Block (RB) spanning one slot? a. 12 b. 72 c. 168 d. 84 19 / 30 19. What is the duration of a standard LTE radio frame? a. 10 ms b. 1 ms c. 0.5 ms d. 5 ms 20 / 30 20. How many subcarriers are in a single 5G NR Resource Block (RB)? a. 24 b. 6 c. 12 d. 48 21 / 30 21. Which signal is used for the Secondary Synchronization Signal (SSS) in 5G NR? a. Kasami Sequence b. Zadoff-Chu Sequence c. Hadamard Code d. m-sequence 22 / 30 22. What sequence is used for the Primary Synchronization Signal (PSS) in LTE and 5G NR? a. M-sequence b. Gold Sequence c. Barker Code d. Zadoff-Chu Sequence 23 / 30 23. Why is SC-FDMA (DFT-s-OFDM) primarily utilized for LTE and 5G NR uplink transmissions? a. It eliminates the need for a cyclic prefix b. It has lower PAPR to preserve UE battery power c. It enables non-contiguous resource allocations d. It offers higher peak data rates than CP-OFDM 24 / 30 24. Which physical channel carries the Master Information Block (MIB) in LTE? a. PBCH b. PDSCH c. PCFICH d. PDCCH 25 / 30 25. What modulation scheme carries 2 bits per symbol? a. 64-QAM b. BPSK c. QPSK d. 16-QAM 26 / 30 26. Which coding scheme is used to protect control channels (e.g., PDCCH, PBCH) in 5G NR? a. Turbo Coding b. Polar Coding c. LDPC Coding d. Reed-Solomon Coding 27 / 30 27. Which 3GPP document covers 5G NR physical layer multiplexing and channel coding? a. TS 38.212 b. TS 38.214 c. TS 38.201 d. TS 38.211 28 / 30 28. Which physical channel carries Downlink Control Information (DCI) in 5G NR? a. PDCCH b. PBCH c. PDSCH d. PUCCH 29 / 30 29. Which physical channel informs the UE about the number of OFDM symbols used for the control region in an LTE subframe? a. PHICH b. PDCCH c. PCFICH d. PDSCH 30 / 30 30. What is the maximum number of OFDM symbols in a standard 5G NR slot using a normal cyclic prefix? a. 12 b. 6 c. 7 d. 14 Your score is
