UE Radio Capability Switching to Prevent Dual RRC Connections
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Solution Overview
Problem
In wireless communications networks without an N26 interface, User Equipment (UE) operating in Dual Registration mode may inadvertently connect to two different core networks and establish multiple Radio Resource Control connections when transitioning out of 5GS/NR coverage, leading to network configuration inefficiencies and potential service disruptions.
Innovation Solution
The UE transitions to an idle state and updates its radio access capabilities by sending a request to modify or delete existing capabilities, allowing it to re-establish connections efficiently with a single core network, thereby avoiding simultaneous connections to multiple core networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE continues to operate in Dual Registration mode when transitioning out of 5GS/NR coverage, then the UE can maintain registration with both EPC and 5GC, but the UE will establish two RRC connections to the same eNB, causing network configuration conflicts and service disruptions
Solution Approach 1:
The patent implements dynamic state transitions for the UE, switching between connected and idle states based on the target RAT type. When the target RAT is E-UTRA, the UE transitions to idle state to prevent dual RRC connection conflicts, while maintaining the ability to return to connected state when appropriate. This dynamic adaptation resolves the contradiction by adjusting the registration behavior according to the specific network environment.
Solution Approach 2:
The patent changes the radio access capability parameters based on the target RAT type. When transitioning to E-UTRA, the UE modifies its radio access capability to indicate single registration mode, effectively changing the operational parameters to avoid conflicts. This parameter adjustment allows the UE to maintain adaptability while ensuring reliable connection management.
2Device complexity
If the UE maintains the same radio access capability configuration across different RATs, then the configuration process is simplified, but the UE cannot optimize performance for specific RAT requirements and may cause connection conflicts
Solution Approach 1:
The patent segments the radio access capability configuration into RAT-specific configurations. Instead of using a single universal configuration, the UE maintains separate radio access capability settings for different RAT types (5GS/NR and E-UTRA). This segmentation allows optimized performance for each RAT while managing complexity through systematic organization of configurations.
Solution Approach 2:
The patent implements dynamic switching between different radio access capability configurations based on the target RAT type. The UE selectively applies appropriate capability configurations when transitioning between 5GS/NR and E-UTRA, enabling optimized performance for each specific RAT while maintaining manageable complexity through context-dependent configuration selection.
3Loss of information
If the UE immediately updates radio access capability upon detecting RAT change, then the network configuration remains current, but the update process may cause service interruptions during the transition
Solution Approach 1:
The patent performs preliminary state transition to idle before updating the radio access capability. By switching to idle state first, the UE prepares for the capability update in a controlled manner that minimizes service disruption. This preliminary action ensures that the capability update occurs at an appropriate moment in the state transition sequence, maintaining both accuracy and continuity.
Solution Approach 2:
The patent implements periodic or event-triggered capability updates based on state transitions rather than continuous updates. The radio access capability is updated at specific intervals or events (such as when transitioning between connected and idle states), which reduces unnecessary updates and minimizes service interruptions while keeping the network configuration current.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for modifying a radio capability. One method includes determining that an update of a radio access capability for a first radio access technology is required based at least in part on whether to use a second radio access technology. The method includes switching to an idle state based on determining that the update of the radio access capability for the first radio access technology is required and transmitting a request message indicating that the update of the radio access capability for the first radio access technology is required in response to switching to the idle state, the request message further indicating to delete a stored radio access capability associated with the UE and obtain a new radio access capability associated with the UE.