10.1.2 Slot structure and physical resources
36.2113GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical channels and modulationRelease 17TS
10.1.2.1 Resource grid
A transmitted physical channel or signal in a slot is described by one or several resource grids of 
subcarriers and 
SC-FDMA symbols. The resource grid is illustrated in Figure 10.1.2.1-1. The slot number within a radio frame is denoted 
where 
for 
and 
for 
.
Figure 10.1.2.1-1: Uplink resource grid for NB-IoT
The uplink bandwidth in terms of subcarriers 
, and the slot duration 
are given in Table 10.1.2.1-1.
Table 10.1.2.1-1: NB-IoT parameters.
|
Subcarrier spacing |
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|
|
|
|
|
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A single antenna port 
is used for all uplink transmissions.
10.1.2.2 Resource elements
Each element in the resource grid is called a resource element and is uniquely defined by the index pair 
in a slot where 
and 
are the indices in the frequency and time domains, respectively. Resource element 
corresponds to the complex value 
. Quantities 
corresponding to resource elements not used for transmission of a physical channel or a physical signal in a slot shall be set to zero.
10.1.2.3 Resource unit
Resource units are used to describe the mapping of the NPUSCH to resource elements. A resource unit is defined as 
SC-FDMA symbols in the time domain and 
consecutive subcarriers in the frequency domain, where 
and 
are given by Tables 10.1.2.3-1 and 10.1.2.3-2 for frame structure types 1 and 2, respectively.
Table 10.1.2.3-1: Supported combinations of 
, 
, and 
for frame structure type 1.
|
NPUSCH format |
|
|
|
|
|
1 |
3.75 kHz |
1 |
16 |
7 |
|
15 kHz |
1 |
16 |
||
|
3 |
8 |
|||
|
6 |
4 |
|||
|
12 |
2 |
|||
|
2 |
3.75 kHz |
1 |
4 |
|
|
15 kHz |
1 |
4 |
Table 10.1.2.3-2: Supported combinations of , , and for frame structure type 2.
|
NPUSCH format |
|
Supported uplink-downlink configurations |
|
|
|
|
1 |
3.75 kHz |
1, 4 |
1 |
16 |
7 |
|
15 kHz |
1, 2, 3, 4, 5 |
1 |
16 |
||
|
3 |
8 |
||||
|
6 |
4 |
||||
|
12 |
2 |
||||
|
2 |
3.75 kHz |
1, 4 |
1 |
4 |
|
|
15 kHz |
1, 2, 3, 4, 5 |
1 |
4 |
