SS/PBCH (6GR)
The sub-tab of the Carrier Definition tab configures the synchronization signal blocks (SS/PBCH blocks) for a downlink carrier. Use the instance selector's , , and buttons to manage the collection (the first SS block cannot be removed).
SS/PBCH Enabled - Enables or disables this SS block. It is the first row of the tab; while it is cleared, the rows below it are grayed.
Default: Selected
Numerology - (Read-only) Reports the numerology (subcarrier spacing) of this SS block. An SS block always uses its carrier's subcarrier spacing and cannot be given a numerology of its own; to change it, set the carrier's Resource Grid numerology. The numerology constrains the Pattern and Lmax choices.
Choices: µ = 0 : 15 kHz kiloHertz: A radio frequency measurement (one kilohertz = one thousand cycles per second)., µ = 1 : 30 kHz, µ = 2 : 60 kHz, µ = 3 : 120 kHz
RB Offset / Number - One row holding two values. RB Offset sets the RB offset of the SS block within the carrier's resource grid. RB Number is read-only — the SS block always occupies 20 resource blocks.
Default: RB Offset 253, RB Number 20
Subcarrier Offset - Sets the subcarrier offset of the SS block.
Default: 0
Range: 0 to 23
Periodicity - Sets the SS block transmission periodicity. The millisecond figures assume the nominal system rate (one radio frame is 10 ms); the actual duration scales with System Rate Scale Factor.
Default: 10 ms (1 frame)
Choices: 5 ms (0.5 frame), 10 ms (1 frame), 20 ms (2 frames), 40 ms (4 frames), 80 ms (8 frames), 160 ms (16 frames)
Lmax - Sets the maximum number of SS blocks per transmission opportunity. The choice is constrained by the numerology: below 60 kHz SCS the maximum is L8; above 60 kHz SCS the value is L64.
Default: L4
Choices: L4 (maximum 4 SS blocks), L8 (maximum 8), L64 (maximum 64)
Active Indices - Sets which SS block indexes are active, as a list or range (for example, ).
Default: all indexes active
Auto Detect Active Blocks - Detects the active SS blocks automatically.
Default: Selected
Auto Detect Threshold - The power threshold for automatic active-block detection.
Default: -30 dB
Range: -100 to 0 dB
SS Block Pattern - Sets the SS block time-position pattern (per 3GPP TS Technical Specification 38.213). The pattern is determined by the numerology except at 30 kHz SCS, where two patterns are valid: at µ = 0 the pattern is Case A, at µ = 3 it is Case D (both read-only); at µ = 1 choose Case B ({4,8,16,20} + 28·n) or Case C ({2,8} + 14·n). At every numerology other than µ = 1 the parameter is unavailable, and its tooltip says so.
Default: Case B
Choices (µ = 1): Case B, Case C
Half Frame Index - Sets which half frame carries the SS block.
Default: 0
PSS / PBCH Power Boosting - One row holding two values. PSS Power Boosting sets the power boost applied to the PSS, and PBCH Power Boosting the boost applied to the PBCH, each relative to the SS block's other channels.
Default: 0 dB for both
Range: -30 dB to 30 dB
See Also
