Voice Domain Preference Configuration for 5G Legacy Support
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Solution Overview
Problem
Current wireless communication systems face challenges in configuring voice domains and radio access technologies for user equipment (UE) to ensure optimal voice services, particularly in scenarios where 5G voice is not supported or optimized, leading to poor call quality or network fallback to legacy technologies.
Innovation Solution
The system allows for the configuration of voice domains and radio access technologies based on user equipment preferences, enabling network handovers to support preferred voice services, such as VoLTE or circuit-switched fallback, while maintaining registration with the initial network, thereby ensuring higher quality voice communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE disables 5G and reselects a legacy compatible alternative because VoNR is not supported, then legacy voice service compatibility is maintained, but the UE cannot engage in any communication over the 5G network
Solution Approach 1:
The patent segments the network access function by introducing a voice domain preference configuration that separates voice service handling from general network access. The UE can maintain 5G data connectivity while directing voice services to appropriate networks based on configured preferences (VoNR, VoLTE, or CSFB), thus resolving the contradiction between maintaining voice compatibility and enabling 5G access.
Solution Approach 2:
The patent implements dynamic network selection based on voice domain preferences. Instead of a static fallback mechanism, the UE dynamically selects the appropriate network for voice services based on configured preferences and current network conditions, allowing flexible adaptation while maintaining both 5G access capability and voice service reliability.
2Adaptability or versatility
If the UE supports VoNR but is not optimized to handle it, then 5G voice capability is enabled, but the user may experience poor quality calls
Solution Approach 1:
The patent applies preliminary action by configuring voice domain preferences in advance before actual voice calls occur. The network or UE pre-configures the preferred voice domain (VoNR, VoLTE, or CSFB) based on capability assessments, ensuring that when a voice call is needed, the UE is already optimized to use the most appropriate and highest quality available voice service.
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports its voice capability status and network conditions to the network, which then provides appropriate voice domain preference configurations. This feedback loop ensures that the UE uses the optimal voice service for its capabilities, preventing poor call quality while maintaining 5G voice capability where available.
3Reliability
If the network handovers voice service to a legacy network while maintaining registration with the 5G network, then voice service quality is improved, but network complexity increases
Solution Approach 1:
The patent introduces voice domain preference configuration as an intermediary layer between the UE and multiple networks. This configuration acts as a mediator that simplifies the complexity by providing clear, pre-determined rules for network selection, eliminating the need for complex real-time decision-making logic in the UE while still achieving optimal voice service quality through appropriate network handovers.
Data Source
AI summary
Aspects of the disclosure relate to systems and methods for configuring a voice domain preference and/or a radio access technology (RAT) preference for a user equipment (UE) in a radio access network (RAN) according to the capability and compatibility of the UE. The UE may send at least one of a requested voice domain preference or a requested RAT preference to a 5G core network (5GC). The UE may also receive, from the 5GC, at least one of a voice domain preference or a RAT preference based on, for example, the capability and compatibility of the UE. The 5GC may additionally generate a RAT/frequency selection priority (RFSP) index for the UE, giving priority to the voice domain preference and/or the RAT preference of the UE. The 5GC may communicate the RFSP index to the RAN. Other aspects, embodiments, and features are also claimed and described.