LTE TDD

CSI-RS Downlink (Advanced TDD Downlink)

For Waveform Playback (ARB) capability.

This topic describes the settings of the Downlink > CSI-RS node for an Advanced TDD Downlink carrier.

CSI-RS State

CSI-RS Power

Number of CSI-RS Antenna Ports

CSI-RS Antenna Port

CSI-RS Configuration

CSI-RS Subframe Configuration (I_CSI-RS)

CSI-RS Periodicity (T_CSI-RS)

CSI-RS Subframe Offset (Delta_CSI-RS)

CSI-RS State

Turns the channel state on or off.

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

CSI-RS Power

Set a power level, in dB for the Channel State Information Reference Signal (CSI-RS).

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

Number of CSI-RS Antenna Ports

Selects the number of antenna ports for CSI-RS signals. Must be less than or equal to the total number of antennas.

The combination of the Number of CSI-RS Antenna Ports and Total Number of Antennas determines the resource elements that are reserved for reference signals.

If Total Number of Antennas is changed, the software sets the Number of CSI-RS Antenna Ports equal to the total number of antennas.

Refer to 3GPP TS 36.211 and 36.213.

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:CSIRs:NAPorts PORT1\|PORT2\|PORT4\|PORT8 [:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:CSIRs:NAPorts?
SCPI Example	:RADio:LTETdd:WAVeform:CCARrier:DLINk:CSIRs:NAPorts PORT1 :RADio:LTETdd:WAVeform:CCARrier:DLINk:CSIRs:NAPorts?
Couplings	Coupled to Total Number of Antennas (must be ≤ Total Number of Antennas). Controls CSI-RS Antenna Port and the valid range of CSI-RS Configuration.
Preset	PORT1
State Saved	Yes
Min	N/A
Max	N/A
Initial S/W Revision	A.20.01

CSI-RS Antenna Port

Query only

Read-only setting set by Number of CSI-RS Antenna Ports. Available port selections depend on the number of CSI-RS antenna ports selected.

Mapping:

1 port : Port 15
2 ports : Ports 15 to 16
4 ports : Ports 15 to 18
8 ports : Ports 15 to 22

Formula: ((Antenna Port) mod (Number of CSI-RS Antenna Ports)) + 15

Refer to 3GPP TS 36.211 and 36.213.

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:CSIRs:APORt?
SCPI Example	:RADio:LTETdd:WAVeform:CCARrier:DLINk:CSIRs:APORt?
Notes	Computed by software from Number of CSI-RS Antenna Ports.
Choices	Port 15 \| Ports 15-16 \| Ports 15-18 \| Ports 15-22
Preset	PORT15
State Saved	No
Min	N/A
Max	N/A
Initial S/W Revision	A.20.01

CSI-RS Configuration

Sets the CSI-RS subframe configuration index. This defines both CSI-RS periodicity and CSI-RS subframe offset in accordance with 3GPP TS 36.211 and 36.213.

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:CSIRs:CONF <integer> [:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:CSIRs:CONF?
SCPI Example	:RADio:LTETdd:WAVeform:CCARrier:DLINk:CSIRs:CONF 0 :RADio:LTETdd:WAVeform:CCARrier:DLINk:CSIRs:CONF?
Couplings	The valid range is coupled to Number of CSI-RS Antenna Ports and Cyclic Prefix: Normal CP: 0-31 (1 or 2 ports) 0-9 and 20-25 (4 ports) 0-4 and 20-22 (8 ports) Extended CP: 0-27 (1 or 2 ports) 0-7 and 16-21 (4 ports) 0-3 and 16-18 (8 ports)
Preset	0
State Saved	Yes
Min	0
Max	31
Initial S/W Revision	A.20.01

CSI-RS Subframe Configuration (I_CSI-RS)

Sets the CSI-RS Subframe Configuration index which defines both CSI-RS Periodicity and CSI-RS Subframe Offset parameters (Delta_CSI-RS).

Refer to 3GPP TS 36.211 and 36.213.

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:CSIRs:SFConf <integer> [:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:CSIRs:SFConf?
SCPI Example	:RADio:LTETdd:WAVeform:CCARrier:DLINk:CSIRs:SFConf 0 :RADio:LTETdd:WAVeform:CCARrier:DLINk:CSIRs:SFConf?
Dependencies	Controls CSI-RS Periodicity (T_CSI-RS) and CSI-RS Subframe Offset (Delta_CSI-RS).
Preset	0
State Saved	Yes
Min	0
Max	154
Initial S/W Revision	A.20.01

CSI-RS Periodicity (T_CSI-RS)

Query only

Read-only setting automatically computed by software from CSI-RS Subframe Configuration (I_CSI-RS).

Mapping:

I_CSI-RS = 0 to 4: T_CSI-RS = 5
I_CSI-RS = 5 to 14: T_CSI-RS = 10
I_CSI-RS = 15 to 34: T_CSI-RS = 20
I_CSI-RS = 35 to 74: T_CSI-RS = 40
I_CSI-RS = 75 to 154: T_CSI-RS = 80

Refer to 3GPP TS 36.211 and 36.213.

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:CSIRs:PERiod?
SCPI Example	:RADio:LTETdd:WAVeform:CCARrier:DLINk:CSIRs:PERiod?
Preset	5
State Saved	No
Min	5
Max	80
Initial S/W Revision	A.20.01

CSI-RS Subframe Offset (Delta_CSI-RS)

Query only

Read-only setting automatically computed and set by software from CSI-RS Subframe Configuration (I_CSI-RS).

Mapping:

I_CSI-RS = 0-4 → Delta = I_CSI-RS

I_CSI-RS =5-14 → Delta =I_CSI-RS − 5

I_CSI-RS =15-34 →Delta = I_CSI-RS − 15

I_CSI-RS = 35-74 → Delta = I_CSI-RS − 35

I_CSI-RS =75-154 → Delta = I_CSI-RS − 75

Refer to 3GPP TS 36.211 and 36.213.

SCPI Command	[:SOURce]:RADio:LTETdd:WAVeform[:ARB]:CCARrier<channel>:DLINk:CSIRs:SFOFfset?
SCPI Example	:RADio:LTETdd:WAVeform:CCARrier:DLINk:CSIRs:SFOFfset?
Preset	0
State Saved	No
Min	0
Max	79
Initial S/W Revision	A.20.01