PUCCH resource allocation

[dart73]

Hello guys,

could you kindly explain the parameters noOfPucchCqiUsers and noOfPucchSrUsers and how do I correctly dimension it for DUS31 and DUS41.
This is also related to pdcchCfiMode right? Using 10Mhz bw here. 1 carrier.

Some cells aready presenting overload.


Br,

[wolverine]

There is a good document in CPI/ALEX called Control Channel Dimensioning that explains all.

But in summary..

noOfPucchSrUsers should equal the expected # of RRC connections (peak) that you will have in a cell. If less, it will cause blocking. noOfPucchCqiUsers typically is set to the same value but it doesn't have to. Lack of noOfPucchCqiUsers will not cause blocking.

Increasing both or either of the above will increase the amount (in steps) of PUCCH PRB. So you don't want to over-dimension. PUCCH PRB will go up in steps so in reality only certain values of the above parameters "make sense".

A different approach is to keep the above parameters at current/low values and use the feature Inactivity-Triggered PUCCH Release at High Load. This will allow UEs to go out of sync when idle and thus free up PUCCH resources for other users.