Discussion Points-
Below is the pictorial representation of SSB Freq, PointA freq, Actual carrier frequency, Actual Carrier freq bandwidth.
absoluteFrequencySSB: Frequency of the SSB to be used for this serving cell. The frequency provided in this field identifies the position of subcarrier #0 of resource block RB#10 of the SS block. SS block contains 20 RB (240 subcarrier), The frequency mentioned in IE (absoluteFrequencySSB) is correspond of subcarrier #0 of resource block RB#10 of SS block.
absoluteFrequencyPointA: Position of reference block, also know as PointA. Unlike LTE case, NR support multiple sub-carrier spacing, so to locate the exact usable freq location of cell, it is necessary to define some reference point.
offsetToCarrier: This is offset between reference PointA and lowest usable subcarrier on this carrier in number of PRB.
carrierBandwidth: Width of actual carrier in number of PRB, max possible PRB value is (275)
Note -
1. Unit of offsetToCarrier and carrierBandwidth is PRB and a PRB contains the 12 sub-carrier. In NR there are multiple sub carrier, so which particular sub-carrier is used defined under IE-SCS-SpecificCarrier (refer figure - Major parameters under IE-frequencyInfoDL)
Conclusion-
1. There is one reference Point called as PointA.
2. Center frequency locations of the synchronization signal and actual physical carrier are different.
3.
1. What is SSB frequency, how UE get this information in en-dc case.
2. What is Reference PointA, what is the significance of this, how UE get this information.
3. Whats is offsetToCarrier.
During NR cell addition (Pscell and Scell), n/w defines all above parameters under IE - frequencyInfoDL. This IE is applicable for both Primary cell and secondary cell. Like wise MCG group, SCG group also contain one primary cell (Pscell) and one or more secondary cells (Scells). Likewise frequencyInfoDL, there is corresponding Upink part also but here we will explain all these parameter in terms of DL reference.
Below is the pictorial representation of SSB Freq, PointA freq, Actual carrier frequency, Actual Carrier freq bandwidth.
absoluteFrequencySSB: Frequency of the SSB to be used for this serving cell. The frequency provided in this field identifies the position of subcarrier #0 of resource block RB#10 of the SS block. SS block contains 20 RB (240 subcarrier), The frequency mentioned in IE (absoluteFrequencySSB) is correspond of subcarrier #0 of resource block RB#10 of SS block.
absoluteFrequencyPointA: Position of reference block, also know as PointA. Unlike LTE case, NR support multiple sub-carrier spacing, so to locate the exact usable freq location of cell, it is necessary to define some reference point.
offsetToCarrier: This is offset between reference PointA and lowest usable subcarrier on this carrier in number of PRB.
carrierBandwidth: Width of actual carrier in number of PRB, max possible PRB value is (275)
Note -
1. Unit of offsetToCarrier and carrierBandwidth is PRB and a PRB contains the 12 sub-carrier. In NR there are multiple sub carrier, so which particular sub-carrier is used defined under IE-SCS-SpecificCarrier (refer figure - Major parameters under IE-frequencyInfoDL)
Conclusion-
1. There is one reference Point called as PointA.
2. Center frequency locations of the synchronization signal and actual physical carrier are different.
3.
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