What is the need for NCD SSB in Redcap BWP?

5G NR
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1

Hi All.

In rel17, what is the need for NCD SSB in Redcap BWP?

I mean CD SSB could serve the purpose.

One reason is it saves freq domain resources because of no SIB1 associated.

But is there any other reason?

2

Hi Folks,
NCD-SSB introduced by 3GPP for REDCAP R17 feature.
why we need NCD-SSB

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Want to know more about that please refer this article good explanation I found https://trickyard.com/what-is-ncd-ssb-and-cd-ssb-in-redcap-nr-r17/
nonCellDefiningSSB
If configured, the RedCap UE operating in this BWP uses this SSB for the purposes for which it would otherwise have used the cell-defining SSB of the serving cell (e.g.
obtaining sync, measurements, RLM). Furthermore, other parts of the BWP configuration that refer to an SSB (e.g. the “SSB” configured in the QCL-Info IE; the “ssb-Index”
configured in the RadioLinkMonitoringRS; CFRA-SSB-Resource; PRACH-ResourceDedicatedBFR) refer implicitily to this NCD-SSB.
The NCD-SSB has the same values for the properties (e.g., ssb-PositionsInBurst, PCI, ssb-periodicity, ssb-PBCH-BlockPower) of the corresponding CD-SSB apart from the
values of the properties configured in the NonCellDefiningSSB-r17 IE.