SS/PBCH (5G NR/5G-Advanced)
The panel contains the available SS-Block and PBCH parameters for up to four SS/PBCHs.
Add SS/PBCH - Adds an SS/PBCH to the transmission (up to four SS/PBCHs). When an SS/PBCH is added, a representative button is added at the top of the SS/PBCH parameter group.
Remove SS/PBCH - Removes the selected SS/PBCH.
Clear All - Removes all but the original SS/PBCH.
Enable Channels... - Quickly enables and disables the configured SS/PBCHs in a single dialog. You can also enable channels individually using the SS/PBCH checkbox at the top of each SS/PBCH.
SS/PBCH - When enabled, the selected SS/PBCH is applied to the Component Carrier.
When an SS/PBCH is enabled, any enabled physical channels within that SS/PBCH will be included in analysis. When an SS/PBCH is disabled, no physical channels within that SS/PBCH will be included in analysis.
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SS/PBCH is not supported when PDSCH Physical Downlink Shared Channel Auto Detection Mode is set to Power Based. In this case, SS/PBCH is automatically disabled. |
Default: enabled
Lmax - Sets the maximum number of possible SS/PBCH blocks in a transmission opportunity. This value is fixed for a given carrier bandwidth. Typically, higher frequency and bandwidth carriers use a larger set of SS/PBCH opportunities to support a larger set of antenna beams.
Default: L4 (based on a default 100 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. Bandwidth)
SSB Transmitted - Determines the set of SS Block indexes (zero-based, or the index of first SSB block of Lmax is 0) of the half frame on which the analyzer shall not receive other signals or channels in REs that overlap with REs corresponding to the SS/PBCH blocks.
Default: 0:3 (based on a default 100 MHz Bandwidth)
Auto Detect Active Block - Enables or disables auto detection of which SS/PBCH blocks are active.
When enabled, SS/PBCH blocks are determined as active when power exceeds the relative level specified by Det Power Threshold.
When disabled, all SS/PBCH blocks specified in Active SS Block Indexes are assumed to be active.
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When an SS/PBCH block is determined as active, it is included in summary table results, and is included in traces like Error Vector Spectrum and IQ plots. Both active and inactive SS/PBCH blocks are included in SS/PBCH trace results. |
Default: enabled
Det Power Threshold - Sets the power threshold (in dB, relative to maximum SS/PBCH block power) to use to decide if an SS/PBCH block is active. This property only applies when Auto Detect Active Block is enabled.
Default: -30 dB
RB Offset(15kHz|60kHz) - Sets the SS Block RB offset for this SS/PBCH.
A resource block (RB) consists of 12 contiguous subcarriers. The numerology used for RB Offset depends on the carrier Bandwidth. For FR1 bandwidths, RB Offset is always in 15kHz. For FR2 bandwidths, RB Offset is always in 60kHz.
When SSB/PBCH Auto Detection is enabled, the detected RB Offset for FR1 bandwidths is always in 15kHz, and the detected RB Offset for FR2 bandwidths is always in 60kHz.
The reference point of RB Offset is Point A. RB Offset 0 means the center of the lowest SS/PBCH subcarrier is Point A. SS/PBCH always occupies 20 RBs. The maximum RB Offset is the Grid Size of the Component Carrier for that particular Numerology.
Use the kSSB(15kHz|60kHz|120kHz) setting to adjust the SS Block's offset at the subcarrier level. See kSSB(15kHz|60kHz|120kHz) for more information.
Default: 253 RB (based on a default FR1 100 MHz Bandwidth and and 30kHz SS/PBCH numerology)
Numerology - Sets the numerology for this SS/PBCH.
Numerology specifies the subcarrier spacing and cyclic prefix definition used for this SS/PBCH.
See About Mixed Numerologies for information about multiple/mixed numerologies.
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Numerology affects symbol duration and the number of subcarriers possible for a given carrier bandwidth. |
Default: µ = 1 : 30 kHz kiloHertz: A radio frequency measurement (one kilohertz = one thousand cycles per second). (based on a default FR1 100 MHz Bandwidth)
Choices: Available choices depend on the selected carrier Bandwidth:
FR1 bandwidths: µ = 0 : 15 kHz, µ = 1 : 30 kHz
FR2 bandwidths: µ = 3 : 120 kHz, µ = 4 : 240 kHz
kSSB(15kHz|60kHz|120kHz) - Sets the subcarrier offset between the first subcarrier of SS/PBCH and the last subcarrier of RB Offset(15kHz|60kHz).
The numerology used for kSSB depends on the carrier Bandwidth. For FR1 bandwidths, kSSB is always in 15 kHz. For FR2 bandwidths, kSSB follows the Scs Common setting (60 kHz or 120 kHz).
If there is a frequency delta (difference) between the measurement center frequency and the carrier center, adjust the VSA's SS/PBCH RB Offset and kSSB accordingly to reflect this difference. It's best to match offsets; however, if you can't achieve an exact match between the generated signal's center frequency offset and the offset created using the VSA's RB Offset and kSSB settings, you may still get good EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format. results as long as the residual frequency offset is within the frequency lock range See Extend Frequency Lock Range.
One simple method of aligning the measurement center frequency offset with RB Offset is to always offset the center frequency by an integer number of (Scs * 12); by doing so, you only need to offset the RB offset with the same integer number.
The calculation is:
freqOffset = CarrierCenter – MeasCenter;
New RB Offset = Old RB Offset + integerOf(freqOffset / (Scs * 12));
where Scs is the subcarrier spacing indicated beside the RB Offset of SS/PBCH (it can be 15kHz or 60kHz).
Default: 0
Range: Available choices depend on the selected carrier Bandwidth:
FR1 bandwidths: 0 - 23
FR2 bandwidths: 0 - 11
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When the SS Block numerology is 30 kHz or 120 kHz, kSSB is limited to even-numbered entries. If an odd number is entered, the value will round down to the closest even number. |
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The unit of RB Offset and kSSB of SS/PBCH depends on the numerology. If the numerology is 15kHz or 30kHz, the RB Offset and KSSB are in 15kHz; if the numerology is 120kHz or 240kHz, the RB Offset and kSSB are in 60kHz. The default values of RB Offset and kSSB make sure that the SSB is in the middle of the carrier bandwidth. |
SS Block Pattern - Sets the Time Domain pattern of SSB Transmission as defined in 3GPP 38.213. The selected SSBlock numerology determines the available SS Block pattern(s).
Default (SS Block numerology µ = 1 :30 kHz): CaseB
Choices:
SS Block numerology µ = 1 :15 kHz - CaseA
SS Block numerology µ = 1 :30 kHz - CaseB, CaseC
SS Block numerology µ = 1 :120 kHz - CaseD
SS Block numerology µ = 1 :240 kHz - CaseE
SCS Common - Sets subCarrierSpacingCommon, the subcarrier spacing of the common resource block.
This setting is only available for FR2 carrier Bandwidths.
Default: 60 kHz
Choices: 60 kHz, 120 kHz
Periodicity - Sets the periodicity for the SS/PBCH block.
Periodicity refers to how often an SS/PBCH occurs in a signal transmission.
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This value may impact the required acquisition length for a measurement, as SS/PBCH physical channels are only guaranteed to occur based upon the periodicity specified. For instance, if 40 ms is specified, 40 ms (plus extra for alignment searching and Result Length) of acquired data may be required for a successful measurement of physical channels within the SS/PBCH. |
Default: 5ms
Range: 5ms, 10ms, 20ms, 40ms, 80ms, 160ms
Half Frame Index - Indicates whether the SSB is transmitted in the first half frame (0) or second half frame (1).
There are three prioritized ways that Half Frame Index may be set:
Highest priority - The VSA software retrieves the half frame information from the PBCH DMRS match operation. This method is only active when L = 4.
Second priority - The VSA software retrieves the half-frame information from the decoded MIB. This method is only active when the VSA is set to use MIB to do synchronization
Lowest priority - The User-entered Half Frame Index value is used to determine whether to transmit the SSB in the first or second half frame.
Default: 0
Choices: 0, 1
Power Boosting
PSS Power Boosting - When enabled, sets the relative power boosting (in dB) of the PSS.
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PSS Power Boosting and PBCH Power Boosting levels are required for SS/PBCH Auto Detection. |
Default: 0 dB
PBCH Power Boosting - When enabled, sets the relative power boosting (in dB) of the PBCH, PBCH DMRS and SSS.
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PSS Power Boosting and PBCH Power Boosting levels are required for SS/PBCH Auto Detection. |
Default: 0 dB
3GPP Version - Determines the 3GPP standard the SS/PBCH is compliant with.
R18 Latest (2023-12) - Interprets the SS/PBCH in compliance with R18 as of 2023-12.
18.1.0 (2023-12) - Interprets the SS/PBCH according to version 18.1.0 of 38.211 (2023-12)
17.4.0 (2023-01) - Interprets the SS/PBCH according to version 17.4.0 of 38.211 (2023-01)
17.3.0 (2022-09) - Interprets the SS/PBCH according to version 17.3.0 of 38.211 (2022-09)
16.8.0 (2021-12) - Interprets the SS/PBCH according to version 16.8.0 of 38.211 (2021-12)
16.5.0 (2021-03) - Interprets the SS/PBCH according to version 16.5.0 of 38.211 (2021-03)
16.2.0 (2020-06) - Interprets the SS/PBCH according to version 16.2.0 of 38.211 (2020-06)
16.1.0 (2020-03) - Interprets the SS/PBCH according to version 16.1.0 of 38.211 (2020-03)
15.8.0 (2019-12) - Interprets the SS/PBCH according to version 15.8.0 of 38.211 (2019-12)
15.6.0 (2019-06) - Interprets the SS/PBCH according to version 15.6.0 of 38.211 (2019-06)
15.5.0 (2019-03) - Interprets the SS/PBCH according to version 15.5.0 of 38.211 (2019-03)
15.4.0 (2018-12) - Interprets the SS/PBCH according to version 15.4.0 of 38.211 (2018-12)
15.3.0 (2018-09) - Interprets the SS/PBCH according to version 15.3.0 of 38.211 (2018-09)
15.0.0 (2017-12) - Interprets the SS/PBCH according to version 15.0.0 of 38.211 (2017-12)
Default: R18 Latest (2023-12)
Choices: R18 Latest (2023-12), 18.1.0 (2023-12), 17.4.0 (2023-01), 17.3.0 (2022-09), 16.8.0 (2021-12), 16.5.0 (2021-03), 16.2.0 (2020-06), 16.1.0 (2020-03), 15.8.0 (2019-12), 15.6.0 (2019-06), 15.5.0 (2019-03), 15.4.0 (2018-12), 15.3.0 (2018-09), 15.0.0 (2017-12)
See Also
5G NR/5G-Advanced Demod Properties Dialog Box
