LTE FDD

Preambles NPRACH (NB-IoT)

For Waveform Playback (ARB) capability.

This topic describes the settings of the Preambles node for NB-IoT NPRACH.

NPRACH Burst

Enabled

Power

Preamble Format

NPRACH Resource Periodicity

Frequency Hopping

Number of Subcarriers

Subcarriers Offset

Initial Subcarrier Index

Timing

Number of Repetitions per Attempt

Starting Time

NPRACH Burst

Enabled

SCPI Command	[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt[:STATe] ON\|OFF\|1\|0 [:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt[:STATe]?
SCPI Example
Notes
State Saved	Yes
Preset	ON
Initial S/W Revision	A.19.00

Power

Range: -60.000 to 20.000 dB

Default: 0.000 dB

Enter a power level, in dB for the selected PRACH burst, relative to the carrier power.

SCPI Command	[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:POWer <real> [:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:POWer?
SCPI Example
Notes
State Saved	Yes
Preset	0
Min	-60
Max	20
Initial S/W Revision	A.19.00

Preamble Format

Range: 0 to 1

Default: 0

Enter a value for the PRACH preamble format.

See chapter 10.1.6.1 in TS36.211 for more information.

SCPI Command	[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:FORMat F0\|F1 [:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:FORMat?
SCPI Example
Notes
State Saved	Yes
Preset	F0
Initial S/W Revision	A.19.00

NPRACH Resource Periodicity

Choices: 40ms | 80 ms | 160 ms | 240 ms | 320 ms | 640 ms | 1280 ms | 2560 ms.

Default: 80ms

To generate valid signal, NPRACH Resource Periodicity must be longer than (Starting Time + 4 * Number of Repetitions per Attempt * Symbol Group Length + Gap), where Symbol Group Length is 1.4 ms for preamble format 0 and 1.6 ms for preamble format 1.

Gap will be 40 ms when Number of Repetitions per Attempt is 128, and will be 0 for other cases.

SCPI Command	[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:PERiodicity MS40\|MS80\|MS160\|MS240\|MS320\|MS640\|MS1280\|MS2560 [:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:PERiodicity?
SCPI Example
Notes
State Saved	Yes
Preset	MS80
Initial S/W Revision	A.19.00

Frequency Hopping

Number of Subcarriers

Choices: 12 | 24 | 32 | 48

Default: 12

See nprach-NumSubcarrier in chapter 10.1.6 in TS36.211 for more information.

SCPI Command	[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:NUMB N12\|N24\|N36\|N48 [:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:NUMB?
SCPI Example
Notes
State Saved	Yes
Preset	N12
Initial S/W Revision	A.19.00

Subcarriers Offset

Choices: 0 | 12 | 24 | 36 | 2 | 18 | 34

Default: 0

Sets the frequency location of the first subcarrier allocated to NPRACH. The sum of Subcarrier Offset and Number of Subcarriers should not be more than 48.

See nprach-SubcarrierOffset parameter in Chapter 10.1.6 in TS36.211 for more information.

SCPI Command	[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:OFFSet N0\|N2\|N12\|N18\|N24\|N34\|N36 [:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:OFFSet?
SCPI Example
Notes
State Saved	Yes
Preset	N0
Initial S/W Revision	A.19.00

Initial Subcarrier Index

Choice: 0 to Number of Subcarriers - 1

Default: 0

Sets or gets the first subcarrier for frequency hopping selected by the MAC layer from 0 to nprach-NumSubcarriers-1.

See n_int parameter in Chapter 10.1.6 in TS36.211 for more information.

SCPI Command	[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:INDex <integer> [:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:INDex?
SCPI Example
Notes
State Saved	Yes
Preset	0
Initial S/W Revision	A.19.00

Timing

Number of Repetitions per Attempt

Choices:1 | 2 | 4 | 8 | 16 | 32 | 64 | 128

Default: 8

See numRepetitionsPerPreambleAttempt parameter in Chapter 10.1.6 in TS36.211 for more information.

SCPI Command	[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:REPetitions N1\|N2\|N4\|N8\|N16\|N32\|N64\|N128 [:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:REPetitions?
SCPI Example
Notes
State Saved	Yes
Preset	N8
Initial S/W Revision	A.19.00

Starting Time

Choices: 8 ms | 16 ms | 32 ms | 64 ms | 128 ms | 256 ms | 512 ms | 1024 ms

Default: 8 ms

See nprach-StartTime parameter in Chapter 10.1.6 in TS36.211 for more information.

SCPI Command	[:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:STARt MS8\|MS16\|MS32\|MS64\|MS128\|MS256\|MS512\|MS1024 [:SOURce]:RADio:LTEFdd:WAVeform[:ARB]:CCARrier<channel>:NIOT:PRACh:BURSt:STARt?
SCPI Example
Notes
State Saved	Yes
Preset	MS8
Initial S/W Revision	A.19.00