UE Capability Switching for VoNR Calls on Network Slices
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently establishing voice calls when transitioning between cellular networks with and without network slicing support, leading to unnecessary EPS fallback procedures, which can disrupt ongoing network slices.
Innovation Solution
User equipment (UE) adjusts capabilities to prioritize VoNR calls by deemphasizing EPS fallback procedures, maintaining network slices during transitions, and performing measurements to ensure seamless voice call establishment across networks with and without network slicing support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EPS fallback procedures are used to establish voice calls in heterogeneous networks, then voice call compatibility is improved, but network slice disruption increases
Solution Approach 1:
The UE dynamically adjusts its capability indicators based on whether it is currently utilizing a network slice. When a slice is active, the UE sets VOLTESupported to False to prevent EPS fallback; when no slice is active, it sets VOLTESupported to True to enable fallback. This dynamic adaptation resolves the contradiction by making the system behavior context-dependent.
Solution Approach 2:
The invention changes the parameter values of UE capability indicators (specifically VOLTESupported and VoNRSupported flags) based on network slice utilization status. This parameter adjustment allows the UE to control whether EPS fallback procedures are triggered, thereby resolving the contradiction between voice call compatibility and network slice disruption.
2Stability of the object's composition
If UE capabilities are adjusted to prioritize VoNR calls, then network slice maintenance is improved, but voice call establishment reliability worsens
Solution Approach 1:
The UE dynamically switches its capability profile based on network slice utilization. When a slice is active, the UE presents itself as VoNR-capable only, maintaining slice stability. When no slice is active, the UE presents as VOLTE-capable, ensuring voice call reliability. This dynamic switching resolves the apparent contradiction.
Solution Approach 2:
The UE autonomously determines its own capability indicators based on its internal state (whether it is utilizing a network slice). This self-service mechanism allows the UE to automatically adjust its behavior to maintain network slices when needed while ensuring voice call reliability when slices are not in use, without requiring external control.
3Reliability
If EPS fallback procedures are triggered for voice calls, then voice call compatibility is improved, but network resource efficiency deteriorates
Solution Approach 1:
The invention changes the UE's capability parameters (VOLTESupported flag) based on network slice utilization status. When a slice is active, the UE sets VOLTESupported to False, preventing EPS fallback and preserving network resources. This parameter change resolves the contradiction by aligning voice call establishment method with current network utilization state.
Data Source
AI summary
A user equipment (UE) may initiate an application on a user equipment (UE) which utilizes a network slice via a packet data network (PDN) connection with a first cellular network. The first cellular network may support network slicing and voice over new radio (VONR) and one or more cells of the first cellular network may support evolved packet system (EPS) fallback procedures. The UE may receive or initiate a voice call with another UE and adjust one or more capabilities of the UE such that an EPS fallback procedure is deemphasized. The UE may receive signaling from the first cellular network to establish, based at least in part on the one or more adjusted capabilities of the UE, the voice call as a VoNR call via the first cellular network and the network slice may be maintained during the VoNR call.