Is there any impact of PHR (Power Head Room) on the data throughput ?

Question

What is the use of PHR ? Is there any default configuration or eNodeB can change on the FLY ?

Answer 1

PHR gives info on remaining power at UE can be utilized for UL TX(PUSCH), eNB can use PHR to give more grant to UE or UL grant can be reduced if PHR is low. In this way PHR reporting used to enhance in data throughput.

Answer 2

Yes, PHR should have impact on UL throughput. PHR effectively tells the eNodeB how much power headroom UE has, at current UL MCS and pathloss level. For e.g. a PHR <= 23 tells that the UE is capping and so, eNodeB may have to give a lower MCS or number of RBs.

What do you mean by "Is there any default configuration or eNodeB can change on the FLY ?" PHR is reported by UE. I have explained the effect of PHR on UL scheduling in the first para, the exact implmentation choice is left to eNodeB's design.