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.
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1. SRS Settings |
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References:
3GPP TS 36.211 Physical Channels and Modulation
5.5.3 Sounding reference signal subframe configuration
Table 5.5.3.3-1: FDD sounding reference signal subframe configuration
3GPP TS 36.213 Physical Layer Procedures
8.2 UE sounding procedure
Table 8.2-1: UE Specific SRS Periodicity Tsrs and Subframe Offset Configuration Toffset, FDD
This section defines the LTE/LTE-Advanced FDD DPCCH/DPDCH's buttons. The Restore Default Settings button is available in all of the LTE FDDn Uplink's tree nodes.
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Restores all of the LTE/LTE-Advanced FDD channel's parameters to their default conditions. |
Choice: On | Off
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.
Range: -60 to 20
Default: 0
Enter a power level in dB for the selected channel relative to the carrier power.
Range: 0 to 14
Default: 0
Enter a value for the sounding reference signal subframe configuration.
Range: 0 to 14
Default: 0
Displays the individual subframes separated by commas (example: 0,1, 2,3) assigned to the sounding references. The allocation is calculated by the SRS Subframe Configuration. See 3GPP TS 36.211, Table 5.5.3.3-1.
This subframe allocation information is converted from the cell-specific subframe configuration period (T_SFC) and the cell-specific subframe offset (Delta_SFC) in the Table 5.5.3.3-1.
Range: 0 to 7
Default: 7
Enter a value for the sounding reference signal cyclic shift. Cyclic shift multiplexed signals must have the same bandwidth to maintain their orthogonality. Refer to TS 36.211, Section 5.5.3.
Range: 0 to 7
Default: 0
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, Section 5.5.3 for the sounding reference signal bandwidth associated with each bandwidth configuration.
Range: 0 to 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). This bandwidth is the transmission bandwidth of the SRS. Refer to TS 3.211, Section 5.5.3.
Range: 0, 1
Default: 0
Enter a value for the sounding reference signal transmission comb (kTC) used to calculate the frequency-domain starting position in accordance with TS 36.211 Section 5.5.3.2. The transmission comb is a distributed comb-shaped transmission with equally-spaced outputs allocated over the entire bandwidth.
Range: 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 3.6211.
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)
Range: 0 to 23
Default: 0
Enter a value for the frequency domain position (nRRC), the starting subcarrier of the SRS. Refer to TS 36.211.
Range: 0 to 636
Default: 0
Enter a value for the sounding reference signal configuration index (I_SRS). This determines the SRS Periodicity (T_SRS), and SRS subframe offset (T_offset) in accordance with 3GPP TS 36.213, V8.6.0, Table 8.2-1.
These values indicate the UE specific SRS periodicity (T_SRS) of transmission, allocation information which are calculated by SRS Configuration Index (I_SRS). This is a read only parameter set by the software in accordance with 3GPP TS 36.213, Table 8.2-1.
Range: 0 to 14
Default: 0
These values indicate SRS subframe offset (T_offset), SRS allocation information which are calculated by SRS Configuration Index (srs-ConfigIndex, I_SRS). This is a read only parameter set by the software in accordance with 3GPP TS 36.213, Table 8.2-1.
Displays the frequency hopping state. This is a read only parameter set by the software in accordance with 3GPP 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)