5.3.18 T317 expiry

36.3313GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Protocol specificationRadio Resource Control (RRC)Release 17TS

The UE shall:

1> if in RRC_CONNECTED:

2> inform lower layers that the UL synchronisation is lost;

2> start timer T318;

2> acquire SystemInformationBlockType31 (SystemInformationBlockType31-NB in NB-IoT) as specified in 5.2.2;

2> upon successful acquisition of SystemInformationBlockType31 (SystemInformationBlockType31-NB in NB-IoT):

3> stop timer T318;

3> inform lower layers that the UL synchronisation is restored;

NOTE: SystemInformationBlockType31 (SystemInformationBlockType31-NB in NB-IoT) may be broadcast on a different narrowband or different NB-IoT carrier than the one configured to the UE.