Setting Frequency and Band Parameters

5GNR Analyzer Measurement Guide : 5GNR Analyzer (Option 888) : Setting Frequency and Band Parameters

Setting Frequency and Band Parameters

Frequency and band parameters are set using the FREQ SPAN Menu. The channel center frequency can be set manually. When set to manual band, the ARFCN and GSCN are unassigned. When a predefined band is selected, the center frequency and SSB offset must be set by the ARFCN and GSCN, respectively.

Configuring the Band

The band settings are displayed in the left side status panel and can be directly accessed from those controls. These parameters can also be accessed via the FREQ SPAN menu.

1. Press FREQ SPAN > BAND CONFIG.

2. Select a band from the BAND selection list. When a band is selected, the ARFCN, GSCN, and CHANNEL BW setting can be accessed.

3. Set the ARFCN, GSCN, CHANNEL BW according to the specification.

4. Select a SUBCARRIER SPACING.

5. Select the MAPPING PATTERN:

• P1 for the 3GPP Phase 1 standard, March 2018.

• P2 for the 3GPP Phase 2 standard, September 2018.

• AUTO to use the most recent standard.

FREQ SPAN Menu

The FREQ SPAN menu is available in all 5GNR measurements.

FREQUENCY Menu (5GNR Measurements)
-	BAND CONFIG Opens the BAND CONFIG Menu. CENTER FREQUENCY Sets the center frequency of the measurement channel. Changing the center frequency sets the band to MANUAL. SPAN Sets the sweep frequency range. Pressing the plus (+) or minus (–) control increments the span value in a 1:2:5 sequence. The span can also be changed by pinching the trace in or out when gestures are not toggled off. CHANNEL BW Sets the measurement channel bandwidth. The available bandwidth settings depend on the selected band and bandwidth option installed in the instrument. Refer to “Options Settings” section in Instrument Overview chapter of the user guide. SSB FREQUENCY Sets the absolute SSB frequency. SSB OFFSET SSB is the synchronous signal block. The SSB offset sets the frequency offset between the SSB and the center frequency of the channel. Negative values result in an offset lower than the center frequency. Positive values result in an offset higher than the center frequency. AUTO DETECT SSB Auto detects the center position of the SSB according to the 3GPP raster of GSCN values. If the search is successful, the correct SSB OFFSET is automatically applied and the signal should synchronize for demodulation. See Figure: AUTO DETECT SSB Dialogs (5GNR Measurements). SUBCARRIER SPACING Sets the subcarrier spacing. The available input range is dependent on the selected band. MAPPING PATTERN Select which mapping pattern: P1 for the 3GPP Phase 1 standard, March 2018. P2 for the 3GPP Phase 2 standard, September 2018. Auto selects the most recent standard. GESTURES Opens the GESTURES Menu. Not available in 5GNR Summary, OTA (Multi PCI), Carrier Aggregation and Constellation measurements.

AUTO DETECT SSB Dialogs (5GNR Measurements)
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BAND CONFIG Menu

The BAND CONFIG menu is available in all 5GNR measurements.

BAND CONFIG Menu (5GNR Measurements)
-	BAND Select MANUAL or one of the predefined bands. Selecting MANUAL disables ARFCN and GSCN settings. Selecting a predefined band activates ARFCN and GSCN settings. ARFCN ARFCN is the absolute radio frequency channel number. The ARFCN is a unique identification number assigned to each radio channel within a communications spectrum. The ARFCN can be used to calculate the center frequency of the radio channel. The available input range is dependent on the selected band. CHANNEL BW Sets the measurement channel bandwidth. The available bandwidth settings depend on the selected band and bandwidth option installed in the instrument. Refer to “Options Settings” section in Instrument Overview chapter of the user guide. GSCN GSCN is the global synchronization raster channel. The GSCN identifies the mapping/offset of the synchronous signal block (SSB). The available input range is dependent on the selected band.

Note	The instrument must properly sync to and decode the signal to which the center frequency (or ARFCN), SSB offset (or GSCN), and subcarrier spacing are set to correctly match the 5GNR signal under test.

GESTURES Menu

GESTURES Menu
-	DRAG Toggles the touchscreen drag feature on or off. When toggled off, the center frequency will not change when dragging the spectrum display. This can be useful when dragging markers. Note that the Drag feature can also be toggled on/off by touching the lock icon under the display.