LTE TDD

PRS Downlink (Advanced TDD Downlink)

For Waveform Playback (ARB) capability.

This topic describes the settings of the Downlink > PRS node for an Advanced TDD Downlink carrier.

State

Power

Antenna Mapping (Port 6)

Number of PDCCH Symbols

Bandwidth

Number of Consecutive DL Subframes

Configuration Index (I_PRS)

Periodicity (T_PRS)

Subframe Offset (Delta_PRS)

Muting Sequence Length

Muting Sequence

State

Turns the positioning reference signal (PRS) on or off.

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS[:STATe] ON\|OFF\|1\|0 [:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS[:STATe]?
SCPI Example	:RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS OFF :RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS?
Preset	0
State Saved	Yes
Min	N/A
Max	N/A
Initial S/W Revision	A.20.01

Power

Sets the power level, in dB for the positioning reference signal.

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:POWer <rel_ampl> [:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:POWer?
SCPI Example	:RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:POWer 0 :RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:POWer?
Range	-60 to 20 dB
Preset	0
State Saved	Yes
Min	-60
Max	20
Initial S/W Revision	A.20.01

Antenna Mapping (Port 6)

Sets the antenna mapping for PRS antenna port 6.

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:AMAP <string> [:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:AMAP?
SCPI Example	:RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:AMAP "1" :RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:AMAP?
Range	0 or 1, as comma separated values (CSV), equal to the number of antennas selected.
Dependencies	Length equals Total Number of Antennas.
Preset	"1"
State Saved	Yes
Min	N/A
Max	N/A
Initial S/W Revision	A.20.01

Number of PDCCH Symbols

Sets the number of PDCCH symbols.

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:NPDCch <integer> [:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:NPDCch?
SCPI Example	:RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:NPDCch 1 :RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:NPDCch?
Range	1 to 3 (N_DL_RB > 10) 2 to 3 (N_DL_RB <= 10)
Couplings	Coupled to PRS Bandwidth.
Preset	2
State Saved	Yes
Min	1
Max	3
Initial S/W Revision	A.20.01

Bandwidth

Selects the PRS bandwidth.

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:BANDwidth F1400K\|F3M\|F5M\|F10M\|F15M\|F20M [:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:BANDwidth?
SCPI Example	:RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:BANDwidth F10M :RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:BANDwidth?
Choices	1.4 MHz (6RB) \| 3 MHz (15RB) \| 5 MHz (25RB) \| 10 MHz (50RB) \| 15 MHz (75RB) \| 20 MHz (100RB)
Couplings	PRS Bandwidth must be ≤ System Bandwidth.
Preset	F10M
State Saved	Yes
Min	N/A
Max	N/A
Initial S/W Revision	A.20.01

Number of Consecutive DL Subframes

Selects the number of consecutive downlink subframes for PRS.

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:NSUBf SF1\|SF2\|SF4\|SF6 [:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:NSUBf?
SCPI Example	:RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:NSUBf SF1 :RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:NSUBf?
Choices	1 subframe \| 2 subframes \| 4 subframes \| 6 subframes
Preset	SF1
State Saved	Yes
Min	N/A
Max	N/A
Initial S/W Revision	A.20.01

Configuration Index (I_PRS)

Sets the PRS configuration index. Defines both the periodicity and subframe offset per 3GPP TS 36.211 Table 6.10.2-1.

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:CONF <integer> [:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:CONF?
SCPI Example	:RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:CONF 0 :RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:CONF?
Range	0 to 2399 Formula: (10*SFN + Floor(Slot#/2) - Delta_PRS) mod T_PRS = 0. I_PRS=0-159: T=160, Delta=I I_PRS=160-479: T=320, Delta=I-160 I_PRS=480-1119: T=640, Delta=I-480 I_PRS=1120-2399: T=1280, Delta=I-1120
Couplings	Controls Periodicity and Subframe Offset (read-only).
Preset	0
State Saved	Yes
Min	0
Max	2399
Initial S/W Revision	A.20.01

Periodicity (T_PRS)

Query only

Displays the PRS periodicity in subframes. Value is set by software based on I_PRS.
Enum Values: SF160, SF320, SF640, SF1280

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:PERiod?
SCPI Example	:RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:PERiod?
Notes	Mapping: I_PRS=0-159→SF160 I_PRS=160-479→SF320 I_PRS=480-1119→SF640 I_PRS=1120-2399→SF1280
Dependencies	Set by software from Configuration Index.
Preset	SF160
State Saved	No
Min	N/A
Max	N/A
Initial S/W Revision	A.20.01

Subframe Offset (Delta_PRS)

Query only

Displays the PRS subframe offset. Value is set by software based on Configuration Index(I_PRS).

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:SFOFfset?
SCPI Example	:RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:SFOFfset?
Range	0 to 1279 subframes. Formula: I_PRS=0-159: Delta=I I_PRS=160-479: Delta=I-160 I_PRS=480-1119: Delta=I-480 I_PRS=1120-2399: Delta=I-1120
Dependencies	Set by software from Configuration Index.
Couplings
Preset	0
State Saved	No
Min	0
Max	1280
Initial S/W Revision	A.20.01

Muting Sequence Length

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:MSEQl SL2\|SL4\|SL8\|SL16 [:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:MSEQl?
SCPI Example	:RADio:LTETdd:WAVeform:ARB:CCARrier<:DLINk:PRS:MSEQl SL2 :RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:MSEQl?
Choices	SL2 \| SL4 \| SL8 \| SL16
Couplings	Determines the valid length of Muting Sequence.
Preset	SL2
State Saved	Yes
Min	N/A
Max	N/A
Initial S/W Revision	A.20.01

Muting Sequence

Sets the muting sequence as comma-separated values.

0 = muting
1 = not muting

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:MSEQ <string> [:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:PRS:MSEQ?
SCPI Example	:RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:MSEQ "0" :RADio:LTETdd:WAVeform:ARB:CCARrier:DLINk:PRS:MSEQ?
Notes	Bit string. Length must match Muting Sequence Length.
Dependencies	Length defined by Muting Sequence Length. When Muting Sequence Length is 2 then it is "1,1" When Muting Sequence Length is 4 then it is "1,1,1,1" When Muting Sequence Length is 8 then it is "1,1,1,1,1,1,1,1" When Muting Sequence Length is 16 then it is "1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1"
Preset	1,1
State Saved	Yes
Min	N/A
Max	N/A
Initial S/W Revision	A.20.01