5G NR Control Resource Set (CORESET)

The CORESET configuration obtained from the PBCH also defines and activates the initial bandwidth part in the downlink.

The initial active uplink bandwidth part is obtained from the system information scheduled using the downlink PDCCH.
Once connected, a device can be configured with up to four downlink bandwidth parts and up to four uplink bandwidth parts for each serving cell.

On each serving cell, at a given time instant one of the configured downlink bandwidth parts is referred to as the active downlink bandwidth part for the serving cell and one of the configured uplink bandwidth parts is referred to as the active uplink bandwidth part for the serving cell.

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5G: Bandwidth Part

A bandwidth part is characterized by a numerology (subcarrier spacing and cyclic prefix) and a set of consecutive resource blocks in the numerology of the BWP, starting at a certain common resource block.

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