HI Bharath,
channelBW-90mhz is used to identify the support of 90Mhz BW by UE in gNB. This is optional param. With this UE needs to send supportedBandwidthDL to gNB know supported maximum BW DL.
There is no IE in UE capability to describe UE's support on NSA NR , then How eNB gets this information.
What is the use of pdcch-ConfigSIB1 in MIB of 5G?
There is no IE describes UE's capability on DC? How Network decides this capability?