UE Disaster Roaming via 5GS Registration Type
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Solution Overview
Problem
The 5G System lacks methods for effectively notifying User Equipment (UE) of disaster conditions in public land mobile networks and for selecting alternative networks during such conditions, leading to service disruptions.
Innovation Solution
A method where the User Equipment (UE) initiates a registration request with a 5G System registration type Information Element indicating disaster roaming, allowing it to recognize and respond to disaster conditions and select alternative networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE uses standard registration procedures without disaster roaming indication, then the registration process is simple, but the UE cannot be effectively notified of disaster conditions or select alternative networks
Solution Approach 1:
The disaster roaming indication is nested within the existing 5GS registration type Information Element in the registration request message. This allows the disaster roaming functionality to be embedded within the standard registration procedure structure, adding capability without requiring a completely new message format or protocol.
Solution Approach 2:
The registration request message is modified by changing the value or state of the 5GS registration type Information Element to indicate disaster roaming. This parameter change approach allows the system to distinguish disaster roaming registrations from standard registrations while using the same underlying message structure.
2Reliability
If the UE implements disaster roaming capability, then service continuity during disasters is ensured, but the communication protocol complexity increases
Solution Approach 1:
The 5GS registration type Information Element serves multiple functions: it indicates standard registration, periodic registration, mobility registration, and now disaster roaming registration. This multi-functionality reduces the need for separate dedicated message types or protocol elements for disaster roaming.
Solution Approach 2:
The network side (AMF) acts as an intermediary that processes the disaster roaming indication in the registration request and provides appropriate responses, including disaster condition notifications and alternative network information. This intermediary approach centralizes the complexity in the network rather than requiring complex UE-side disaster management logic.
Data Source
AI summary
A unit is provided through an application of a disaster condition to a PLMN in 5GS, the unit being for transmitting and/or receiving a notification in a case that a communication service cannot be provided to a UE and for selecting a roaming destination PLMN by the UE. Provided are a procedure to allow the UE to recognize a state of a certain PLMN and transmit and/or receive information for appropriately selecting a PLMN as a moving destination in a case that a disaster condition applies or no longer applies to the certain PLMN, a method of selecting a PLMN based on information received and stored by the UE through a notification from the PLMN or the like, and a communication unit.