Generally, two main ways are used to configure the SSB Frequency position.
- ARFCN “Absolute Radio-frequency channel number.”
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It is delivered in the RRC Reconfiguration message to inform the UE about the center frequency of SSB Block directly.
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ARFCN is used to calculate center channel bandwidth and Absolute-SSB-Frequency and is called channel raster.
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The Channel Raster has a relatively high resolution using Low-Frequency scan granularity (15,30,60 & 100Khz).
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The Absolute Radio frequency Number is delivered in the RRC Reconfiguration message, which means that the UE will receive the SSB Frequency domain position directly from the 4G Leg.
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Mainly used in 5G NSA and Handovers.
- GSCN “Global Synchronization Channel Number.”
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GSCN stands for Global synchronization channel number, can be used in both 5G-NSA & 5G SA, and is known as a Synchronization raster.
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The Synchronization Raster defined a set of allowed center frequencies for the Synchronization Signal / Physical Broadcast Channel block.
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The Synchronization raster has a relatively low resolution(1.2,1.44&17.27 MHz) to reduce the number of positions a UE must check when completing a band scan, i.e., the band scan procedure becomes faster and more efficient.
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It can be used in 5G NSA & SA.
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