What is PRB in 5G?

In 5G, One NR Resource Block (RB) contains 12 sub-carriers in frequency domain similar to LTE. In LTE resource block bandwidth is fixed to 180 KHz but in NR it is not fixed and depend on sub-carrier spacing.

Absolute frequency position of the reference resource block (Common RB 0). Its lowest subcarrier is also known as Point A . Note that the lower edge of the actual carrier is not defined by this field but rather in the scs-SpecificCarrierList.

Point A is reference point in 5G system . There is another paramater – offset to carrier. By using both parameter UE compute the actual carrier where different BWP reside.13 Mar 2020

PRBs are the resource blocks which are used for actual transmission/reception . A set of PRBs belongs to and form a BWP. PRBs for a specific subcarrier configuration defined within a BWP are numbered from 0 to (size of BWP – 1). Each BWP has its own set of PRBs.5 Kas 2019