User Equipment Emergency Registration Despite Disaster Roaming Timer
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Solution Overview
Problem
Existing 5G communication systems fail to facilitate emergency calls during disaster situations when a network is affected, due to a running timer that prevents registration on a forbidden PLMN, leading to undesirable delays in accessing emergency services.
Innovation Solution
A method and apparatus for a User Equipment (UE) that allows registering for emergency services while maintaining a disaster roaming timer, enabling emergency calls even when the timer is active, and performing subsequent disaster roaming registration after the emergency call ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a disaster roaming timer is running to prevent network congestion during disaster situations, then network stability is improved, but emergency service access is delayed
Solution Approach 1:
The patent segments the registration process into two distinct paths: regular disaster roaming registration (blocked by timer) and emergency service registration (allowed despite timer). This segmentation allows the system to maintain overall registration stability while enabling urgent emergency access independently.
Solution Approach 2:
The patent introduces an intermediary mechanism where the UE can indicate emergency service requirement in the registration request message. This intermediary signal allows the network to differentiate between regular registration attempts (which should respect the timer) and emergency registration attempts (which should be permitted), thus resolving the contradiction between timer enforcement and emergency access.
2Reliability
If a UE is prevented from registering on a forbidden PLMN during disaster roaming, then network resource protection is improved, but emergency communication capability deteriorates
Solution Approach 1:
The patent applies local quality by treating emergency service registration differently from regular service registration. While the general rule blocks registration on forbidden PLMN during disaster roaming, the patent creates a local exception for emergency services by allowing UEs to indicate emergency requirements in their registration requests, thus permitting selective registration based on service type.
Solution Approach 2:
The patent introduces dynamic behavior where the registration restriction is not absolute but can be overridden when emergency services are required. The system dynamically adjusts the registration policy based on the UE's indicated service requirement, transitioning from a static forbidden state to an allowed state for emergency communications.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Disclosed is a method of operating a User Equipment, UE. The method includes identifying that a timer associated with requesting Disaster Roaming, DR is running, attempting to make an emergency call, and registering for emergency services.