5.40.7.3 Prevention of signalling overload related to Disaster Condition and Disaster Roaming service in EPS

The load control, congestion and overload control mechanism specified in clause 5.19 and access control and barring specified in clause 5.2.5 can be used to mitigate the load caused by returning of UE to allowable PLMN when Disaster Condition is no longer applicable.

To prevent signalling overload in PLMN providing Disaster Roaming service in EPS, the HPLMN or registered PLMN:

• may provide the UE in a prioritized manner with the list of PLMNs described in clause 5.40.2 for Disaster Roaming; and
• may provide Disaster Roaming wait range information to control when the UE can initiate the Attach procedure or Tracking area update procedure for Disaster Roaming service in EPS upon arriving in the PLMN providing Disaster Roaming service in EPS as specified in TS 23.122 [17], TS 24.501 [47]. and TS 24.301 [47].

To prevent signalling overload by returning UEs in PLMN previously with Disaster Condition in 5GS which is no longer applicable, the HPLMN or registered PLMN:

• may provide Disaster Return wait range information to control when the UE can initiate the registration upon returning to the PLMN previously with Disaster Condition as specified in TS 23.122 [17] and TS 24.501 [47].