lteNPRACHInfo
Description
Examples
Get NPRACH Information
Get NPRACH information for specified UE settings and channel transmission configuration.
Specify the narrowband physical layer cell identity and subcarrier spacing.
ue = struct('NNCellID',0,'NBULSubcarrierSpacing','15kHz');
Specify the NPRACH format, periodicity, subcarrier offset, number of subcarriers, and number of preamble repetitions.
chs = struct('NPRACHFormat','0','Periodicity',80, ... 'SubcarrierOffset',0,'NumSubcarriers',12,'NRep',1);
Generate and display the NPRACH information.
info = lteNPRACHInfo(ue,chs)
info = struct with fields:
SubcarrierSpacing: 3750
Nfft: 512
SamplingRate: 1920000
Windowing: 18
FrequencyLocation: [0 1 7 6]
K: 4
NULSC: 12
PreambleParameters: [1x1 struct]
Display the random access preamble parameters, as specified in Table 10.1.6.1-1 [2].
disp(info.PreambleParameters)
G: 4 P: 4 N: 5 T_CP: 2048 T_SEQ: 40960
Input Arguments
ue
— UE-specific settings
structure
UE-specific settings, specified as a structure containing these fields.
Field | Required or Optional | Values | Description | Data Type |
---|---|---|---|---|
NNCellID | Required | Integer in the interval [0, 503] | Narrowband physical layer cell identity. | double |
NBULSubcarrierSpacing | Required | '3.75kHz' , '15kHz' | Narrowband internet of things (NB-IoT) uplink subcarrier spacing. To set
a subcarrier spacing of 3.75 kHz, specify this field as
'3.75kHz' . To set a subcarrier spacing of 15 kHz, specify
this field as '15kHz' . | char , string |
Windowing | Optional | Nonnegative integer, default value depends on NPRACH preamble format in accordance with section F.5.F of [1] | Number of time-domain samples over which the function applies windowing and overlapping of OFDM samples. If you do not specify
this field, this function returns the | double |
Data Types: struct
chs
— Channel transmission configuration
structure
Channel transmission configuration, specified as a structure containing these fields.
Field | Required or Optional | Values | Description | Dependencies | Data Types |
---|---|---|---|---|---|
NPRACHFormat | Required | '0' , '1' ,
'2' | NPRACH preamble format. | Not applicable | char , string |
Periodicity | Required | 40 , 80 , 160 ,
240
(since R2024b), 320 ,
640 , 1280 , 2560 ,
5120 | NPRACH resource periodicity, in milliseconds. | If you set the If you set the
| double |
SubcarrierOffset | Required | 0 , 2 , 6 ,
12 , 18 , 24 ,
34 , 36 , 42 ,
48 , 54 , 60 ,
72 , 78 , 84 ,
90 , 102 ,
108 | Frequency location of the first subcarrier allocated to NPRACH. | If you set the If you set
the | double |
NumSubcarriers | Required | 12 , 24 , 36 ,
48 , 72 , 108 ,
144 | Number of subcarriers allocated to NPRACH. | If you set the If you set the
| double |
NRep | Required | 1 , 2 , 4 ,
8 , 16 , 32 ,
64 , 128 | Number of NPRACH repetitions. | Not applicable | double |
StartTime | Optional | 8 (default), 16 ,
32 , 64 , 128 ,
256 , 512 ,
1024 | NPRACH starting time, in milliseconds. | Not applicable | double |
NInit | Optional | 0 (default), integer in the interval [0,
NumSubcarriers – 1] | Initial subcarrier for NPRACH. | Not applicable | double |
Data Types: struct
Output Arguments
info
— NPRACH resource information
structure
NPRACH resource information, returned as a structure containing these fields.
Field | Values | Description | Data Type |
---|---|---|---|
Nfft | Positive integer | Number of fast Fourier transform (FFT) points. | double |
SamplingRate | Positive scalar | Sampling rate, in Hz, of the time-domain waveform. | double |
Windowing | Nonnegative even integer | Number of time-domain samples over which the function applies windowing and overlapping of OFDM symbols. | double |
FrequencyLocation | Row vector of nonnegative integers | Frequency location for all symbol groups in an NPRACH transmission. For more information about NPRACH symbol groups, see the NB-IoT PRACH Waveform Generation example. The kth element of this output represents the frequency location of the kth symbol group. | double |
K | Positive integer | Ratio of uplink data to NPRACH subcarrier spacing. | double |
NULSC | Positive integer | Number of subcarriers for the specified uplink bandwidth. | double |
PreambleParameters | Structure | Random access preamble parameters for the specified preamble format and frame structure type 1, as specified in Table 10.1.6.1-1 of [2]. | struct |
PreambleParameters
Field
The PreambleParameters
field of this output contains these
fields.
Field | Values | Description | Data Type |
---|---|---|---|
G | Positive integer | Number of time-contiguous symbol groups. | double |
P | Positive integer | Total number of symbol groups. | double |
N | Positive integer | Number of symbols in a symbol group. | double |
T_CP | Positive integer | Cyclic prefix length, in multiples of Ts, where Ts is the basic time unit, defined in section 4 of [2] as 1 ÷ (15000 × 2048) seconds. | double |
T_SEQ | Positive integer | Length of symbols in a symbol group, in multiples of Ts. | double |
Data Types: struct
References
[1] 3GPP TS 36.101. “Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio transmission and reception.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network. https://www.3gpp.org.
[2] 3GPP TS 36.211. “Physical channels and modulation.” 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA). https://www.3gpp.org.
Version History
Introduced in R2021aR2024b: Get NPRACH information for 240 millisecond resource periodicity
You can now get NPRACH resource information for channel transmission configurations with
an NPRACH resource periodicity of 240 milliseconds. To use this feature, specify the
Periodicity
field of the chs
input as
240
. You must specify the NPRACHFormat
of
chs
as 0
or 1
.
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