HandoverPreparationFailure [RadioNetwork-cause=interaction-with-other-procedure]

Hi All,
Can any one tell me the reason HOprep failure?
Nokia MME and Huawe eNB.

HandoverPreparationFailure [RadioNetwork-cause=interaction-with-other-procedure]

If UE has already initiated a call then sometimes eNB block handover procedure until call setup process is completed. This can be one of the reasons for “interaction with other procedure” (call setup is given higher priority over handover". Huawei has parameter to disable this (i think) but then your call setup may fail.