About the 5G New Radio Option
R&S
®
SMW-K144
14User Manual 1178.8013.02 ─ 06
Figure 3-1: Signal processing depending on multiple access scheme
In this implementation, you can define per PUSCh which of the two access schemes is
used.
3.4 Frame Structure, Slots and Slot Formats
Frame structure
As it is in LTE, the 5G NR frame is 10 ms long; a half-frame lasts 5 ms. Frames consist
of 10 subframes, each of them with a length of 1 ms.
Subframes contain a variable number of slots, depending on the subcarrier spacing
(SCS). Moreover, subframes can use different SCS in different bandwidth parts (BWP),
see Figure 3-4.
Because the frame and subframe lengths are constant but the number of slots and
their lengths varies, the common time boundaries between the different numerologies
are the frames or the subframes.
Slots and slots formats
The basic transmission unit in 5G NR is the slot. Slots can have different formats; slots
comprise of 14 or 12 OFDM symbols, depending on the used cyclic prefix (CP). Hence,
depending on the used CP, there are different numbers of slots per frame (and sub-
frame) and the CP itself depends on the used numerology, see Table 3-2.
Slots can have different formats, defined by the slot format index (SFI). The SFI is sig-
naled by group common PDCCHs. The slot formats differ in the number of symbols
that can be used for DL (D) and UL (U) transmission. Most of the symbols are usually
used for transmission of user data (payload). Slots can also contain flexible symbols
(x), that can be used for dynamic DL/UL transmission or as a gap for the DL to UL and
vice versa switching.
The slot formats are defined in TS 38.211, table 4.3.2-3.
3.5 Resource Blocks and Resource Grid
Resource grid
The basic granularity in 5G NR resource grid is the resource element (RE), which
consists of one OFDM symbol over one subcarrier and is the same as in LTE. Another
Resource Blocks and Resource Grid
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