Mobile Device Emergency Service Access During Back-Off Timer
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Solution Overview
Problem
In mobile communication environments, the back-off timer prevents both normal and emergency bearer services from being initiated, even after successful registration with another PLMN, RA, or TA, causing service delays and restrictions.
Innovation Solution
Implementing methods that allow the initiation of service request procedures for emergency bearer services before the back-off timer expires and stopping the timer upon successful registration with another PLMN, RA, or using a different RAT, enabling service requests to be made without delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the back-off timer is started to prevent service request procedures after maximum retries, then the service network is granted sufficient time to recover from temporary problems, but the UE is delayed in obtaining emergency bearer services
Solution Approach 1:
The service request procedure is segmented into normal service requests and emergency bearer service requests. The back-off timer is applied selectively: it restricts normal service requests but does not prevent emergency bearer service requests. This segmentation allows the system to protect network recovery while maintaining emergency service accessibility.
Solution Approach 2:
Different quality restrictions are applied to different service types. Normal services are subject to the back-off timer restriction (local quality of restriction), while emergency bearer services are exempted (local quality of freedom). This localized differentiation resolves the contradiction by applying constraints only where necessary for network protection.
2Reliability
If the back-off timer forbids service request procedures after failure, then the UE avoids repeated failures with a problematic node, but the UE cannot obtain services even after successfully registering with another PLMN, RA, or TA
Solution Approach 1:
The UE performs preliminary registration with alternative PLMN, RA, or TA before attempting service requests. The system detects this successful registration as a condition to clear or bypass the back-off timer restriction, allowing the UE to adaptively access services in new networks without being constrained by previous failures with different nodes.
Solution Approach 2:
The back-off timer restriction is made dynamic rather than static. It is automatically adjusted or cleared when the UE successfully registers with another PLMN, RA, or TA. This dynamic adaptation allows the system to maintain reliability restrictions against problematic nodes while enabling versatility for service access in newly registered networks.
3Reliability
If the UE is forbidden from initiating service request procedures during back-off timer, then network resources are protected from excessive requests, but emergency bearer services cannot be obtained even when critical
Solution Approach 1:
Service request procedures are segmented into normal services and emergency bearer services. The back-off timer mechanism is applied selectively to normal services while emergency bearer services are exempted. This segmentation protects network resources from excessive normal service requests while ensuring emergency services remain accessible even during back-off periods.
Solution Approach 2:
Different quality levels of restriction are applied locally to different service types. Normal services experience the full back-off timer restriction (local quality of constraint), while emergency bearer services experience no restriction (local quality of freedom). This localized differentiation protects network resources while eliminating harmful delays for critical emergency services.
Data Source
AI summary
A method for handling a service request procedure by a mobile communication device is provided. The method includes the steps of: starting a back-off timer associated with a service request procedure in response to the service request procedure for a normal service having been failed for a maximum number of retries, and initiating another service request procedure for an emergency bearer service before the back-off timer expires.