FIG. 6 illustrates the architecture of an uplink subframe in 3GPP LTE.
FIG. 7 is a block diagram illustrating the radio protocol architecture.
FIG. 8 is a diagram showing a contention-based random access method.
FIG. 9 is a diagram showing a non-contention-based random access method.
FIG. 10 is a diagram showing the structure of a random access preamble.
FIG. 11 shows a system that provides a plurality of numerologies according to an embodiment proposed in the present description.
FIG. 12 shows examples in which PRACH resources can be configured according to embodiments proposed in the present description.
FIGS. 13a to 13c show examples of selecting one of a plurality of resources according to embodiments proposed in the present description.
FIGS. 14a and 14b show examples of changing resources according to embodiments proposed in the present description.
FIG. 15 shows a 2-step random access procedure.
FIG. 16 shows a 2-step random access procedure when a random access response is composed of 2-step DCI.
FIG. 17 shows a contention-based random access procedure when a random access response is composed of 2-step DCI.
