Referring to FIG. 10, the random access preamble includes a cyclic prefix (CP) 510 and a preamble sequence 1020. The length of the cyclic prefix can be represented as TCP, and the length of the preamble sequence can be represented as TSEQ.
The random access preamble may have a different format depending on a frame structure and a random access configuration. For this, reference can be made to Table 1 below. In Table 1, Ts indicates a basic time unit.
TABLE 2
Preamble format
TCP
TSEQ
0
?3168 · Ts
24576 · Ts
1
21024 · Ts
24576 · Ts
2
?6240 · Ts
2 · 24576 · Ts
3
21024 · Ts
2 · 24576 · Ts