Non-interleaved CORESET

In a non-interleaved CORESET, the Control Channel Elements (CCEs) are mapped to Resource Element Groups (REGs) in a contiguous manner. This means that the CCEs are transmitted in the same frequency and time domain locations.

For example, a non-interleaved CORESET with an Aggregation Level (AL) of 4 would consist of 4 CCEs that are mapped to the first 4 REGs in a subframe. The 4 CCEs would be transmitted in the same frequency and time domain locations.

Interleaved CORESET

In an interleaved CORESET, the CCEs are mapped to REGs in a scattered manner. This means that the CCEs are transmitted in different frequency and time domain locations.

For example, an interleaved CORESET with an AL of 4 could consist of 4 CCEs that are mapped to the first, fourth, seventh, and tenth REGs in a subframe. The 4 CCEs would be transmitted in different frequency and time domain locations.

ControlResourceSet information element