Aggregation Level

What does Aggregation Level mean ?

It is defined as number of CCE’s used for sending a control information. Its values can be 1,2,4 and 8.

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Number of PDCCH candidates 
Type Aggregation level  Size [in CCEs]
UE-specific 1 6 6
2 12 6
4 8 2
8 16 2
Common 4 16 4
8 16 2
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