Sounding RS (Reference Signal)

When PUCCH or PUSCH is not scheduled, sounding reference signals (SRS) are used to test the reception quality for uplink channel-dependent scheduling and are transmitted in the last symbol of the subframe.The allocation to subcarriers is determined by the SRS bandwidth configuration. SRS can be multiplexed by time (periodic transmissions), frequency, cyclic shifts, and transmission comb.

The setting for this window cannot be changed while transmitting the signal (State On button clicked). To change settings, first click the State Off button to stop the signal.

The software does not use these settings when it is controlling multiple instruments as shown in the tree view.

1. SRS Settings
State	Transmission Comb (kTC)
Power	Hopping Bandwidth (b_hop)
Subframe Configuration	Frequency Domain Position (nRRC)
Subframe (Cell Specific)	Configuration Index ((I_SRS)
Cyclic Shift (nSRS_CS)	Periodicity (T_SRS)
Bandwidth Configuration (C_SRS)	Subframe Offset (T_offset)
Bandwidth (B_SRS)	Frequency Hopping

Buttons

This button indicates that the current real-time settings have been applied to the instrument—no action is required. This button is not available when the Apply Needed button is active. When using multiple instruments as shown in the tree view, this button is not displayed.

This button displays in place of the Settings Current button. It indicates that the instrument settings are not currrent and need to be updated with the new software settings. Click this button to update the insturment's settings. This button shows in all windows regardless of where the change was made. When using multiple instruments as shown in the tree view, this button is not displayed.

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:APPLy

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:APPLy?

State

Choice: On | Off

Default: Off

Coupling: This setting is inactive and set to off when using multiple instruments as shown in the tree view.

Double-click or use the drop-down menu to select the sounding reference signal (SRS) channel state. When the sounding state is enabled, the last symbol of the SRS allocated subframe is reserved for the transmission of the SRS.

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:STATe 1|0|ON|OFF

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:STATe?

Power

Range: -60 to 20

Default: 0

Set the sounding reference signal channel power in dB.

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:POWer <val>

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:POWer?

Subframe Configuration

Range: 0 to 13

Default: 0

Enter a value for the sounding reference signal subframe configuration.

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:SCONfig <val>

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:SCONfig?

Subframe (Cell Specific)

Displays the SRS subframe allocation information that is calculated by the Subframe Configuration. Refer to TS 36.211, Table 5.5.3.3-2. This subframe allocation information is converted from the cell-specific subframe configuration period (T_SFC) and the cell-specific subframe offset (Delta_SFC) shown in the table. The displayed subframes are separated by commas (example: 0,1, 2,3).

Cyclic Shift (nSRS_CS)

Choices: 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7

Default: 0

Double-click or use the drop-down menu to select a value for the sounding reference signal cyclic shift. Refer to TS 36.211.

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:CSHift <val>

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:CSHift?

Bandwidth Configuration (C_SRS)

Choices: 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7

Default: 7

Double-click or use the drop-down menu to select a value for the cell-specific parameter SRS transmission bandwidth (srs-BandwidthConfig, C_SRS). Refer to TS 36.211.

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:BCONfig <val>

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:BCONfig?

Bandwidth (B_SRS)

Choices: 0 | 1 | 2 | 3

Default: 0

Double-click or use the drop-down menu to select a value for the UE-specific parameter SRS bandwidth (srs-Bandwidth, B_SRS). Refer to TS 36.211.

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:BANDwidth <val>

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:BANDwidth?

Transmission Comb (kTC)

Choices: 0 |1

Default: 0

Double-click or use the drop-down menu to select a value given by the UE-specific parameter Transmission comb (transmissionComb, kTC). Refer to TS 36.211.

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:TCOMb <val>

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:TCOMb?

Hopping Bandwidth (b_hop)

Choices: 0 | 1 | 2 | 3

Default: 3

Double-click or use the drop-down menu to select a value for the higher-layer parameter SRS frequency hopping bandwidth (srs-HoppingBandwidth, b_hop). Refer to TS 36.211.

SRS Hopping Bandwidth (b_hop), and Frequency Hopping are related as follows:

Frequency Hopping On: SRS Hopping Bandwidth (b_hop) < SRS Bandwidth (B_SRS)

Frequency Hopping Off: SRS Hopping Bandwidth (b_hop) ≥ SRS Bandwidth (B_SRS)

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:HBANdwidth <val>

[:SOURce]:RADio:LTE:TDD[:BBG]:ULINk:SRSignal:HBANdwidth?

Frequency Domain Position (nRRC)

Range: 0 to 23

Default: 0

Enter a value for the higher-layer parameter frequency domain position (freqDomainPosition, nRRC). Refer to TS 36.211.

[:SOURce]:RADio[n]:LTE:TDD[:BBG]:ULINk:SRSignal:FDPosition <val>

[:SOURce]:RADio[n]:LTE:TDD[:BBG]:ULINk:SRSignal:FDPosition?

Configuration Index (I_SRS)

Range: 0 to 644

Default: 0

Enter a value for the SRS configuration index (I_SRS). This determines the SRS Periodicity (T_SRS), and SRS subframe offset (T_offset) in accordance with TS 36.213.

[:SOURce]:RADio[n]:LTE:TDD[:BBG]:ULINk:SRSignal:CINDex <val>

[:SOURce]:RADio[n]:LTE:TDD[:BBG]:ULINk:SRSignal:CINDex?

Periodicity (T_SRS)

Displays the UE specific SRS periodicity (T_SRS) that is calculated by the SRS Configuration Index (I_SRS). Refer to TS 36.213, Table 8.2-2.

Subframe Offset (T_offset)

Displays the SRS subframe offset (T_offset) that is calculated by the SRS Configuration Index ( I_SRS). Refer to TS 36.213, Table 8.2-2.

Frequency Hopping

Displays the frequency hopping state. Refer to TS 36.211.

SRS Hopping Bandwidth (b_hop), and Frequency Hopping have the following relationship:

Frequency Hopping On: SRS Hopping Bandwidth (b_hop) < SRS Bandwidth (B_SRS)

Frequency Hopping Off: SRS Hopping Bandwidth (b_hop) ≥ SRS Bandwidth (B_SRS)