Troubleshooting Throughput limitation on one site

5G NR
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21

Also check from CellDT trace schErrCode to determine whether the scheduling fails due to insufficient CCE resources.

Also looking at this trend of throughput you have shared seems a suspected case of capping issue (AMBR or Backhaul) :point_down:

One important point even if you check and confirm AMBR “UEAggregateMaximumBitrateDL” from traces is 1G or 2G against your QCI it will not guarantee you the max throughput.

For example in this case for 5G provisioned numbers, UDC is always assigning 1G or 2G but from PCRF, you might see two different values, this needs alignment across all SAPC.

The AMBR can modified by MME. Different MMEs are observed to have different AMBR values based on the node capability.

22

Thanks!

But problem is like not same all the time, even we locked to the same MME, (2,3 out 10 speed test results are best) - so it means that this AMBR should not be the case as it remains same.

(If all the results are same then we can assume any parametric/AMBR related issue).

23

You will not be able to solve your issue without live OSS traces: users, PRBs, CCEs etc.

24

I doubt any parametric mismatch will give you some time low grant and some time higg unless it’s an event or high users

Suggest to have a stress download of the area rather the on a spot.

25

Thanks, working on it.

26

The RIM Configuration is typically used to control the physical layer (PHY) and medium access control (MAC) parameters of the radio interface, such as the channel bandwidth, the modulation scheme, the error correction scheme, the scheduling algorithm, and the power control settings. It may also include other parameters, such as security settings, quality of service (QoS) parameters, and mobility management settings.

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