Patent ID: 11930442
Assignee: APPLE INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A method, comprising:
receiving an indication of a disaster condition, wherein the disaster condition affects at least a first public land mobile network (PLMN), wherein the first PLMN is a home PLMN of a wireless device, wherein the indication of the disaster condition includes one or more of:
an indication from a first cell belonging to a second PLMN that disaster roaming is allowed on the first cell for subscribers of the first PLMN, wherein the indication from the first cell that disaster roaming is allowed on the first cell for subscribers of the first PLMN is provided in system information broadcast by the first cell;
an indication from the first cell that disaster roaming is allowed on the first cell for subscribers of any PLMN;
an indication from a second cell that access to the second cell is not currently available, wherein the second cell is associated with the first PLMN, wherein the indication that access to the second cell is not currently available is provided in system information broadcast by the second cell, wherein an additional indication that one or more Tracking Areas are not suitable due to the disaster condition is provided in system information broadcast by the second cell;
a radio resource control connection release message from a cell associated with the first PLMN, wherein the radio resource control connection release message includes cause information indicating to activate disaster roaming; or
an indication of one or more cells or tracking areas of the first PLMN that are not currently available; and
performing cell selection, wherein one or more cells associated with PLMNs included in a list of PLMNs forbidden for roaming are evaluated for the cell selection based at least in part on the indication of the disaster condition.