Question: In NB-IoT uplink transmission using single-tone transmission with 3.75 kHz subcarrier spacing, what is the composition of each slot in terms of symbol duration and guard period?
Option 1: Each slot consists of 7 symbols with a total duration of 2ms, including a 256Ts cyclic prefix (CP) for each symbol, and the remaining time (2304Ts) is used as a guard period.
Option 2: Each slot comprises 12 symbols with a total duration of 1ms, excluding a 512Ts CP for each symbol, and the remaining time (1536Ts) serves as a guard period.
Option 3: Slots are made up of 5 symbols spanning 3ms, incorporating a 128Ts CP per symbol, with the leftover time (4608Ts) allocated for guarding.
Option 4: Each slot is divided into 10 symbols lasting 2.5ms in total, featuring a 384Ts CP for each, and the residual time (3072Ts) functions as a guard period.
Explanation: This answer reflects NB-IoT's single-tone uplink transmission specifics with 3.75 kHz subcarrier spacing. Each slot's 2ms duration is divided into 7 symbols (each with a 256Ts CP) and a guard period occupying the remaining 2304Ts, highlighting efficient use of time resources in NB-IoT for low-bandwidth IoT applications.