IMPROVED MOBILITY MANAGEMENT FOR NB-IOT USER EQUIPMENT PRIOR TO RADIO LINK FAILURE

The present invention relates to a method to manage mobility prior Radio Link Failure in a NarrowBand-Internet of Things NB-loT user equipment (UE) storing a previously received System Information Block information SIB and having a data sessions in a NarrowBand-Internet of Things network, said method comprising the steps of, in the NB-loT user equipment (UE):- monitoring current transport conditions measurements of current data session connection with a current serving cell (B1) against an investigation threshold (IT(S));- monitoring a buffer status to evaluate the amount of data still needing to be transferred or received and- initiating, itself, at the NB-loT user equipment (UE), investigation measurements on neighbor cells (B2,Bi) of the NarrowBand-Internet of Things network as listed in the stored System Information Block when at least the investigation threshold (IT(S)) is crossed prior Radio Link Failure.