5G UE Band Selection for Voice Calls Without LTE Fallback
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Solution Overview
Problem
Current 5G networks experience throughput reduction and quality of service degradation when voice calls are redirected from non-VoNR 5G bands to 4G/LTE networks due to evolved packet system fallback, affecting ongoing data services.
Innovation Solution
Implementing enhanced mobility techniques in 5G user equipment to seamlessly switch between 5G NR bands, allowing voice calls to be handled within the 5G standalone mode without falling back to LTE, by re-selecting a VoNR-capable band and transferring data radio bearers, thereby maintaining service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If evolved packet system fallback is used to redirect voice calls from non-VoNR 5G bands to 4G/LTE networks, then voice service compatibility is improved, but data service throughput is reduced
Solution Approach 1:
The patent segments the data radio bearers (DRBs) by separating voice-related DRBs from data service DRBs. When voice fallback is needed, only the voice DRBs are redirected to LTE while data service DRBs remain on 5G NR, preventing throughput reduction for ongoing data services.
Solution Approach 2:
The patent applies local quality by treating different DRBs differently during fallback. Instead of redirecting all DRBs to LTE, only the specific DRBs carrying voice traffic are redirected, while other DRBs continue operating on 5G NR with high-speed characteristics.
2Reliability
If all data radio bearers are redirected to 4G/LTE network during voice call fallback, then voice call establishment is ensured, but service quality is degraded
Solution Approach 1:
The patent segments DRBs into voice-specific and data service categories, allowing selective redirection. This ensures voice call establishment on LTE while maintaining data services on 5G NR, thereby preserving overall service quality.
Solution Approach 2:
The patent implements dynamic DRB management where the network can flexibly allocate and redirect specific DRBs based on service requirements. During voice fallback, only necessary voice DRBs are redirected while other DRBs maintain their 5G NR connections for optimal performance.
3Adaptability or versatility
If evolved packet system fallback is implemented for voice calls on non-VoNR bands, then voice service delivery is achieved, but latency increases
Solution Approach 1:
The patent performs preliminary actions by pre-configuring multiple DRBs with different QoS parameters before voice call initiation. This allows the system to quickly redirect appropriate DRBs to LTE for voice services without extensive reconfiguration delays, reducing call setup latency.
Solution Approach 2:
The patent implements feedback mechanisms where the network monitors DRB usage and service requirements in real-time. This enables rapid decision-making for DRB redirection during voice fallback, minimizing the time required to establish voice services while maintaining data service continuity.
Data Source
AI summary
Methods and systems for enhanced mobility for voice calls in a new radio band are disclosed. According to an implementation, data services and/or multimedia services may be provided to a user equipment (UE) through a 5G new radio (NR) in a standalone (SA) mode. During the ongoing data service, the UE may receive a voice call in the current NR band. If the current NR band does not support the voice call, the UE may search and acquire a new NR band capable of providing the voice call. The UE may further set the new NR band as the serving cell and transfer the current data radio bearers (DRBs) assigned for the ongoing data service to the new NR band. While the UE receives new DRBs assigned for the voice call, the UE continues the data service and the voice call in the new NR band.