Path Switching Capability Exchange in 5G Non-3GPP Registration
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Solution Overview
Problem
Current systems lack efficient methods for switching data traffic between non-3GPP access paths in 5G networks, leading to potential interruptions in communications sessions due to unsupported path switching capabilities in AMFs and SMFs.
Innovation Solution
The exchange of capability information between a UE and 5GC during registration, allowing the AMF to determine if it supports non-3GPP path switching and select suitable network functions that match the UE's capabilities, ensuring seamless path switching between different access paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capability information exchange is implemented during registration, then path switching capability matching is improved, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by exchanging capability information during the registration phase, before actual path switching operations are needed. This allows the network to pre-identify suitable AMFs and SMFs that support non-3GPP path switching, ensuring capability matching is established in advance. The UE includes its path switching capability in the registration request, and the network uses this information to select appropriate network functions before any path switching occurs.
2Reliability
If AMF selects suitable network functions based on capability information, then session continuity is improved, but network function selection complexity increases
Solution Approach 1:
The patent implements feedback by having the AMF use the UE's capability information (received during registration) to select suitable SMFs that support path switching. The AMF receives feedback about UE capabilities and uses this information to make informed selection decisions. This ensures that the selected network functions can handle the UE's path switching requirements, maintaining session continuity while managing complexity through capability-based selection criteria.
3Speed
If path switching capability information is exchanged during registration, then path switching speed is improved, but registration procedure complexity increases
Solution Approach 1:
The patent applies merging by combining the capability information exchange with the existing registration procedure. Instead of creating a separate capability negotiation phase, the UE includes its path switching capability in the initial registration request message, and the network responds with acceptance or rejection based on this information. This integration approach enables fast path switching capability matching without adding significant procedural complexity, as the capability exchange is merged into the already-mandated registration flow.
Data Source
AI summary
Methods and apparatus for supporting efficient switching of data paths corresponding to a communications session between different non-3GPP access networks, e.g., networks including WiFi access points, using network core functionality are described. A novel registration process in which UE and AMF capability information is exchanged at an early stage in the registration process is described. An initial registration request message from a UE, via a 3GPP or N3GPP access network, includes an indicator as to whether or not the UE supports path switching for MA PDU sessions between N3GPP access paths. This allows, for a UE which supports the path switching, a AMF to be selected and assigned to the UE, which also supports the path switching, thus matching capabilities and eliminating the need for interrupting communications to change AMFs at a later point.