5G NR Bandwidth Part (BWP)

A Bandwidth Part is a contiguous set of physical resource blocks (PRBs) on a given carrier.
These RBs are selected from a contiguous subset of the common resource blocks for a given numerology (u). It is denoted by BWP. Each BWP defined for a numerology can have following three different parameters.

Subcarrier spacing
Symbol duration
Cyclic prefix (CP) length

Why BWP is Required?

A wider Bandwidth has direct impact on the peak and user experienced data rates, however users are not always demanding high data rate. The use of wide BW may imply higher idling power consumption both from RF and baseband signal processing perspectives. In regards to this, a new concept of BWP has been introduced for 5G-NR provides a means of operating UEs with smaller BW than the configured CBW, which makes NR an energy efficient solution despite the support of the wideband operation.

BWP concept reduce bandband processing requirement to transmit or receive narrow bandwidth

BWP enable RF-Baseband interface operation with a lower sampling rates

UE RF bandwidth adaptation can provide UE power saving at least if carrier bandwidth before adaptation is large.

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Just a little bit of additional information about BWP. I hope my note can be of help:


Another additional information about BWP:


And also this one: