CCE is nothing but control channel element during PDCCH scheduling.
We have four format in PDCCH.Format 0 and 1 uses 1 and 2 cce respectively.
Format 2 and 3 uses 4 and 8 CCE respectively.
Which means user is in poor SINR or poor RSRP.
So we have pdcch coverage enhancement to improve but it has it drawbacks too.
But poor scheduler user will get bad throughput.
So proper physical optimisation will definitely improve it.
RF improvement is PDCCH agg CQI and BLER.
We have four agg. 1 and 2 CCE users in good RF.
4 CCE in medium and poor.
8 CCE very bad RF.
So sometimes medium rf user can consume 8cce, and we don’t want that to happen as it consumes more rb. More RB consume in PDCCH will have an impact on PDSCH Throughput.
We have two cases for example of using more CCE in pdcch:
- Case for remote areas in poor RSRP.
- Case for city in poor SINR.