UE Edge Network Access with Dynamic DNN Re-Evaluation
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Solution Overview
Problem
Current 5G cellular network specifications do not adequately address the need for continuous validation of route selection criteria during UE mobility, leading to potential route unsuitability and inefficient handling of application requirements during edge network access, particularly in scenarios requiring low latency and seamless relocation of edge application servers.
Innovation Solution
Enhancements to the UE's User Equipment Route Selection Policy (URSP) rules, including mechanisms for periodic re-evaluation of route selection validation criteria, DNN replacement rules, and application requirement information, to ensure timely and efficient edge network access and seamless relocation of edge application servers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE uses a DNN provided by URSP rule during PDU session establishment, then the UE can access edge services in a specific location, but when the UE moves to a different location the DNN may become unavailable or inaccessible
Solution Approach 1:
The patent implements dynamic DNN selection by enabling the UE to periodically re-evaluate URSP rules based on current location criteria. The system transitions from a static DNN assignment to a dynamic selection process where the UE can switch between multiple DNNs (including wildcard DNNs) depending on its current location, ensuring continuous access to edge services during mobility.
Solution Approach 2:
The patent changes the DNN parameter from a fixed value to a flexible selectable parameter. By introducing wildcard DNNs and multiple DNN options in URSP rules, the system allows the DNN parameter to change based on location criteria evaluation, enabling the UE to adapt to different edge service locations without session interruption.
2Stability of the object's composition
If the UE does not periodically check Time Window and Location Criteria during PDU session lifetime, then the PDU session remains stable, but the UE will not detect when the route is no longer suitable
Solution Approach 1:
The patent implements periodic re-evaluation of URSP rules during the PDU session lifetime. The UE is configured to periodically check whether current location and time criteria still match the original route selection criteria, ensuring that the route remains suitable while maintaining session stability through structured periodic validation rather than continuous monitoring.
Solution Approach 2:
The system introduces feedback mechanisms where the UE monitors its own location and time criteria against stored URSP rules. When criteria no longer match, the UE receives feedback to re-evaluate and select alternative routes or DNNs, ensuring route suitability is maintained through self-monitoring and adaptive response.
3Reliability
If the core network buffers UL packets during EAS relocation, then seamless relocation can be achieved, but the SMF may not accurately know the buffer space or buffering time needed
Solution Approach 1:
The patent implements preliminary action by having the UE provide application requirement information to the SMF before EAS relocation begins. This allows the SMF to pre-configure appropriate buffer space and buffering time parameters in the PSA UPF, ensuring seamless relocation without packet loss while avoiding the need to accurately predict requirements during the relocation process.
Solution Approach 2:
The patent introduces an intermediary mechanism where the UE acts as a mediator between the application requirements and the core network buffering configuration. The UE translates application-specific requirements into network-configurable parameters, enabling the SMF to configure appropriate buffering resources without directly understanding application-level requirements.
4Adaptability or versatility
If the UE flushes DNS cache completely when moving to a new edge network, then the UE can discover new edge services, but existing DNS cache references are lost
Solution Approach 1:
The patent extracts only the necessary DNS cache entries for the current edge network while preserving other useful cache references. Instead of complete flushing, the system selectively removes or updates DNS entries that are no longer valid for the new location, maintaining beneficial cache references for future use while enabling discovery of new edge services.
Data Source
AI summary
Methods, apparatus, and systems are described for improved edge network access for a UE. According to some aspects, a UE may receive a first Data Network Name (DNN) from an application and determine, based on a Data Network Name (DNN) Replacement Rule, the first DNN is associated with a second Data Network Name (DNN), where the first DNN and the second DNN are different. The UE may determine, based on the DNN Replacement Rule, to associate traffic from the application with a Protocol Data Unit (PDU) Session, where the PDU Session may be used to send data from the application to a network and the PDU Session is associated with the second DNN.