SRS (5G NR/5G-Advanced)
The panel contains the available parameters for one or more uplink sounding reference signal.
Add SRS - Adds an SRS to the transmission. When a SRS is added, a representative button is added at the top of the SRS parameter group.
Remove SRS - Removes the selected SRS.
Clear All - Removes the selected SRS.
Enable Channels... - Quickly enables and disables the configured SRSs in a single dialog. You can also enable channels individually using the Enabled checkbox at the top of each SRS.
Enabled - Enables or disables the selected SRS. You can also control all configured SRSs using the Enabled Channels dialog.
Resource ID - Specifies a unique SRS resource configuration identifier for the selected SRS.
Default: 0
Range: 0 to 63
BWP ID - Assigns the selected SRS to one of the five available bandwidth parts.
Default: BWP0
Choices: BWP0, BWP1, BWP2, BWP3, BWP4
General/Sequence
Ports Number - Specifies the number of antenna ports in the SRS.
Default: 1
Choices: 1, 2, 4
Antenna Port - Selects an antenna port. The available ports depends on the number of ports specified by the Ports Number parameter.
Default: 1000
Choices: 1000, 1001, 1002, 1003 depending on Ports Number setting)
Sequence ID - Sets the sequence identity for the selected SRS.
Default: 0
Range: 0 to 65535
GroupOrSequence Hopping - Sets the hopping type to be used.
Default: Neither
Choices: Neither, Group Hopping, Sequence Hopping
Transmission Comb - Sets the transmission comb number for the SRS sequence.
Default: N2
Choices: N2, N4, N8
Comb Offset - Sets the transmission comb offset for the SRS sequence.
Default: 0
Range: 0 to 1 (Transmission Comb = N2); 0 to 3 (Transmission Comb = N4); 0 to 1 (Transmission Comb = N8)
Cyclic Shift - Sets the number of cyclic shifts for the antenna port.
Default: 0
Range: 0 to 7 (Transmission Comb = N2); 0 to 11 (Transmission Comb = N4); 0 to 5 (Transmission Comb = N8)
Time Domain Allocation
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VSA doesn't support every combination of slot period and slot offset. If the offset and period don't allow the slot allocation to repeat in every frame, only the first allocated slot is measured. |
Resource Type - Sets the resourceType for the selected SRS, as defined in 3GPP TS Technical Specification 38.214.
Default: CustomDefined
Choices: Aperiodic, Semi-Persistent, Periodic, CustomDefined
Allocated Slots (Resource Type = Aperiodic or CustomDefined) - Sets the slots that are allocated for the SRS.
Syntax example: 0,2:4 (slots 0, 2, 3 and 4 are allocated)
Default: 0
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When Resource Type = Periodic or Semi-Persistent, the slot allocation is configured using slot offset and slot period. |
Slot Period (Resource Type = Semi-Persistent or Periodic) - Sets the periodicity, or TSRS value (in slots), which is used along with Slot Offset to determine the allocated slots for the SRS.
Default: 1
Range: 0 to 1000
Slot Offset (Resource Type = Semi-Persistent or Periodic) - Sets the slot offset, or Toffset value (in symbols), which is used along with Slot Period to determine the allocated slots for the SRS.
Default: 0
Range: 0 to 2147483647
Symbol Number - Sets the number of consecutive OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS. symbols used for SRS resource mapping.
Default: 1
Choices: 1, 2, 4, 8, 12
Repetition Factor - Sets the repetition factor for the SRS resource mapping.
Default: 1
Choices: 1, 2, 4, 8, 12
Start Position - Sets the SRS start position in the time domain (in symbols), counting backwards from the end of the slot in accordance with TS 38.211 [16], clause 6.4.1.4. For example, Start Position value 0 refers to the last symbol in the slot, value 1 refers to the second to last symbol, and so on.
The symbol start location relative to the beginning of a slot depends on whether the cyclic prefix (CP 1) Contention period, or 2) Cyclic prefix) is normal or extended. For normal CP, a Start Position value of 0 would be the 13th symbol relative to the beginning of the slot, a Start Position value of 1 would be the 12th symbol relative to the beginning of the slot, etc. For extended CP, a Start Position value of 0 would be the 11th symbol relative to the beginning of the slot, a Start Position value of 1 would be the 10th symbol relative to the beginning of the slot, etc.
The start position is from 0 to N_symb_slot – 1, where N_symb_slot is the symbol number per slot (for normal CP, it is 14; for extended CP, it is 12).
The real symbol start of SRS = N_symb_slot - 1 - l_offset, where I_offset is the Start Position on the GUI.
Default: 0
Range: 0 to (N_symb_slot - 1)
Slot Format - Sets the slot format used for the SRS.
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3GPP Version 15.1.0 (2018-03) and later |
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Format |
Symbol number in a slot |
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| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | ||
| 0 | D | D | D | D | D | D | D | D | D | D | D | D | D | D | |
| 1 | U | U | U | U | U | U | U | U | U | U | U | U | U | U | |
| 2 | X | X | X | X | X | X | X | X | X | X | X | X | X | X | |
| 3 | D | D | D | D | D | D | D | D | D | D | D | D | D | X | |
| 4 | D | D | D | D | D | D | D | D | D | D | D | D | X | X | |
| 5 | D | D | D | D | D | D | D | D | D | D | D | X | X | X | |
| 6 | D | D | D | D | D | D | D | D | D | D | X | X | X | X | |
| 7 | D | D | D | D | D | D | D | D | D | X | X | X | X | X | |
| 8 | X | X | X | X | X | X | X | X | X | X | X | X | X | U | |
| 9 | X | X | X | X | X | X | X | X | X | X | X | X | U | U | |
| 10 | X | U | U | U | U | U | U | U | U | U | U | U | U | U | |
| 11 | X | X | U | U | U | U | U | U | U | U | U | U | U | U | |
| 12 | X | X | X | U | U | U | U | U | U | U | U | U | U | U | |
| 13 | X | X | X | X | U | U | U | U | U | U | U | U | U | U | |
| 14 | X | X | X | X | X | U | U | U | U | U | U | U | U | U | |
| 15 | X | X | X | X | X | X | U | U | U | U | U | U | U | U | |
| 16 | D | X | X | X | X | X | X | X | X | X | X | X | X | X | |
| 17 | D | D | X | X | X | X | X | X | X | X | X | X | X | X | |
| 18 | D | D | D | X | X | X | X | X | X | X | X | X | X | X | |
| 19 | D | X | X | X | X | X | X | X | X | X | X | X | X | U | |
| 20 | D | D | X | X | X | X | X | X | X | X | X | X | X | U | |
| 21 | D | D | D | X | X | X | X | X | X | X | X | X | X | U | |
| 22 | D | X | X | X | X | X | X | X | X | X | X | X | U | U | |
| 23 | D | D | X | X | X | X | X | X | X | X | X | X | U | U | |
| 24 | D | D | D | X | X | X | X | X | X | X | X | X | U | U | |
| 25 | D | X | X | X | X | X | X | X | X | X | X | U | U | U | |
| 26 | D | D | X | X | X | X | X | X | X | X | X | U | U | U | |
| 27 | D | D | D | X | X | X | X | X | X | X | X | U | U | U | |
| 28 | D | D | D | D | D | D | D | D | D | D | D | D | X | U | |
| 29 | D | D | D | D | D | D | D | D | D | D | D | X | X | U | |
| 30 | D | D | D | D | D | D | D | D | D | D | X | X | X | U | |
| 31 | D | D | D | D | D | D | D | D | D | D | D | X | U | U | |
| 32 | D | D | D | D | D | D | D | D | D | D | X | X | U | U | |
| 33 | D | D | D | D | D | D | D | D | D | X | X | X | U | U | |
| 34 | D | X | U | U | U | U | U | U | U | U | U | U | U | U | |
| 35 | D | D | X | U | U | U | U | U | U | U | U | U | U | U | |
| 36 | D | D | D | X | U | U | U | U | U | U | U | U | U | U | |
| 37 | D | X | X | U | U | U | U | U | U | U | U | U | U | U | |
| 38 | D | D | X | X | U | U | U | U | U | U | U | U | U | U | |
| 39 | D | D | D | X | X | U | U | U | U | U | U | U | U | U | |
| 40 | D | X | X | X | U | U | U | U | U | U | U | U | U | U | |
| 41 | D | D | X | X | X | U | U | U | U | U | U | U | U | U | |
| 42 | D | D | D | X | X | X | U | U | U | U | U | U | U | U | |
| 43 | D | D | D | D | D | D | D | D | D | X | X | X | X | U | |
| 44 | D | D | D | D | D | D | X | X | X | X | X | X | U | U | |
| 45 | D | D | D | D | D | D | X | X | U | U | U | U | U | U | |
| 46 | D | D | D | D | D | X | U | D | D | D | D | D | X | U | |
| 47 | D | D | X | U | U | U | U | D | D | X | U | U | U | U | |
| 48 | D | X | U | U | U | U | U | D | X | U | U | U | U | U | |
| 49 | D | D | D | D | X | X | U | D | D | D | D | X | X | U | |
| 50 | D | D | X | X | U | U | U | D | D | X | X | U | U | U | |
| 51 | D | X | X | U | U | U | U | D | X | X | U | U | U | U | |
| 52 | D | X | X | X | X | X | U | D | X | X | X | X | X | U | |
| 53 | D | D | X | X | X | X | U | D | D | X | X | X | X | U | |
| 54 | X | X | X | X | X | X | X | D | D | D | D | D | D | D | |
| 55 | D | D | X | X | X | U | U | U | D | D | D | D | D | D | |
| 56 | Reserved | ||||||||||||||
| 57 | Reserved | ||||||||||||||
| 58 | Reserved | ||||||||||||||
| 59 | Reserved | ||||||||||||||
| 60 | Reserved | ||||||||||||||
| 61 | Reserved | ||||||||||||||
| 62 - 255 | Reserved | ||||||||||||||
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The Slot Format, X Symbols, First Symbol and Last Symbol parameters are designed for maximum flexibility to allow for UE User Equipment (e.g. cell phone)-specific configurations. It is up to the user to decide what is needed for a valid configuration. |
Default: 1: U,U,U,U,U,U,U,U,U,U,U,U,U,U
DL Down Link (forward link: from base station to cell phone) X Symbols - Sets the desired flexible (X) symbols within the selected slot format as downlink (D) symbols. After selecting a slot format, you can designate any X symbols within the format as D symbols by specifying them using this parameter.
Example:
Slot Format = 2: X X X X X X X X X X X X X X
DL X Symbols = 0,2,10:13
0,2 means X symbols 0 and 2 are used for Downlink
10:13 means X symbols 10, 11, 12, 13 are used for Downlink
Resulting Format = D X D X X X X X X X D D D D
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The Slot Format, X Symbols, First Symbol and Last Symbol parameters are designed for maximum flexibility to allow for UE-specific configurations. It is up to the user to decide what is needed for a valid configuration. |
Freq Domain Allocation
FreqDomain Position - Sets the frequency domain position. FreqDomain Position, along with FreqDomain Shift, are used to align the SRS allocation to the 4 PRB common resource block grid.
Default: 0
Range: 0 to 67
FreqDomain Shift - Adjusts the SRS allocation to align with the common resource block grid.
Default: 0
Range: 0 to 268
FreqHopping C-SRS - Sets the SRS bandwidth configuration index. FreqHopping C-SRS, along with FreqHopping B-SRS, based on Table 6.4.1.4.3-1 of 3GPP TS 38.211. See 3GPP TS 38.211 for more information.
Default: 0
Range: 0 to
FreqHopping B-SRS - Sets the BSRS value, which is used to determine mSRS and Nb based on Table 6.4.1.4.3-1 of 3GPP TS 38.211, and helps to determine hopping status when compared to the value of Bhop. See 3GPP TS 38.211 for more information.
Default: 0
Range: 0 to 63
FreqHopping B-Hop - Sets the Bhop value, which is used along with FreqHopping B-SRS (BSRS) to determine hopping status. If Bhop ≥ BSRS, frequency hopping is disabled. If Bhop < BSRS, frequency hopping is enabled. See 3GPP TS 38.211 for more information.
Default: 0
Range: 0 to 3
Start RB Hopping - Enables or disables RB hopping, per clause 6.4.1.4.3 of TS38.211-v17.3.0. When enabled, use the Freq. Scaling Factor and Start RB Index parameters to configure RB hopping.
Default: False (disabled)
Freq. Scaling Factor - Sets the frequency scaling factor for RB hopping.
Default: 1
Choices: 1, 2, 4
Start RB Index - Sets the start RB index for RB hopping.
Default: 0
Range: 0 to (Freq. Scaling Factor - 1)
Power and Other
Power Boosting - Sets the relative power boosting (in dB) of the SRS.
Default: 0 dB
See Also
5G NR/5G-Advanced Demod Properties Dialog Box
