Patent ID: 11968535
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method performed by a User Equipment (UE) for handling an invalid System Information (SI) signature in a communication system, the method comprising:
obtaining, from an access node, System Information (SI) and an associated SI signature for a cell served by the access node and which the UE can use;
determining whether the obtained SI signature is valid or invalid;
in response to determining that the SI signature is invalid:
determining whether to bar the cell based on a UE configuration indicating whether cells with invalid SI signatures should be barred and, if not, using the cell, or, if so, barring the cell and selecting another cell to use; and
triggering Radio Resource Control (RRC) re-establishment and/or Non-Access Stratum (NAS) recovery in addition to barring the cell, when the UE is in RRC_CONNECTED mode and the invalid SI signature is determined after a handover of the UE to a new cell.