Downlink data notification failure Indication - 3GPP error code 87

[Rifa]

Hi,
In our customer network we have Nokia eNodeB and Huawei MME. Lately we are observing lots of error 87 from MME. This error 87 - UE not responding, kind of causing panic to our customer. Would appreciate if someone could share the possible reasons for this error in MME, and what are setting that could be checked in MME to make sure there is nothing to do with paging. If this is because of paging what needed to be corrected.

From radio point of view, we have requested Nokia to ensure no coverage issue and all RF is optimized.

Appreciate your advice.

Thank you,

[sade]

Hi,
That's quite interesting, could you present example of such a failed transaction?
What is your configuration of DRX feature? Does this problem happen from any particular point in time? Is it related to any particular type of terminal?