Forbidden TAI List Maintenance in 5G NR Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing 5G NR systems face challenges in maintaining a proper forbidden tracking area identifier (TAI) list, as UEs are not efficiently updated with allowed tracking areas, leading to potential service disruptions and unnecessary restrictions, especially when registered for emergency services.
Innovation Solution
A method where a UE receives a service area list from the network, compares it with the forbidden TAI list, and removes matching allowed TAs, unless registered for emergency services, thereby dynamically managing the forbidden TAI list through registration requests and configuration updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE removes allowed TAI from the forbidden TAI list upon receiving service area list, then service accessibility is improved, but emergency service reliability may be compromised
Solution Approach 1:
The patent applies local quality by differentiating the treatment of TAIs based on service type. When emergency service is detected, the system preserves the forbidden TAI list unchanged, while for normal services it dynamically updates the list by removing allowed TAIs. This localized differentiation ensures emergency services maintain reliable access restrictions while normal services benefit from improved accessibility.
Solution Approach 2:
The patent implements dynamics by making the forbidden TAI list management adaptive rather than static. The system dynamically adjusts its behavior based on the detected service type - switching between preservation mode (for emergency services) and update mode (for normal services). This dynamic approach allows the system to optimize for the appropriate objective based on current operational context.
2Reliability
If the UE maintains a forbidden TAI list to prevent service restrictions, then network security is improved, but service accessibility deteriorates
Solution Approach 1:
The patent applies preliminary action by proactively detecting whether emergency service is registered before processing the service area list. This advance detection allows the system to prepare the appropriate response - either preserving the forbidden TAI list for security or updating it for accessibility - before the actual service request is processed, preventing both security breaches and unnecessary restrictions.
Solution Approach 2:
The patent implements parameter changes by modifying the state of the forbidden TAI list based on the service type parameter. When emergency service is detected, the preservation parameter is activated; otherwise, the update parameter is activated. This parameter-driven approach allows flexible switching between security-oriented and accessibility-oriented behaviors.
3Measurement precision
If the UE periodically resets the forbidden TAI list, then list accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies periodic action by implementing periodic resetting of the forbidden TAI list at predetermined intervals. This periodic maintenance ensures the list remains accurate and up-to-date without requiring continuous updates, balancing list accuracy with reduced signaling overhead compared to event-driven update approaches.
Data Source
AI summary
A method of maintaining a proper forbidden tracking area identifier (TAI) list is proposed. A UE receives a service area list comprising one or more allowed tracking areas. The service area list may be carried by a configuration update command. UE compares if any of the allowed tracking area having a matching TAI in the forbidden TAI list. Accordingly, UE removes any allowed tracking areas having a matching TAI from the forbidden TAI list. In one embodiment, UE sends a REGISTRATION REQUEST message to initiate a registration procedure. In response, UE receives a REGISTRATION ACCEPT message, which may also carry a service area list. UE may remove the allowed tracking area having a matching TAI from the forbidden TAI list. However, if UE is registered for emergency services, then UE shall not remove the allowed tracking area from the forbidden TAI list.