IMS Voice Session Establishment in 5G Networks
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Solution Overview
Problem
The existing EPS fallback mechanism in 5G networks often leads to unnecessary call setup delays and reduced call quality due to the handover from 5G NR to LTE networks, especially when 5G network conditions are sufficient for voice calls.
Innovation Solution
The network refrains from triggering the EPS fallback during the initiation of IMS voice sessions if the UE supports 5G communications and the 5G network conditions are sufficient, allowing the voice call to establish and maintain better quality on the 5G network. Once the call is established, the network determines if a handover to LTE is necessary based on coverage and network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EPS fallback mechanism is triggered during IMS voice session establishment in 5G networks, then network coverage and reliability are improved, but call setup delays increase and call quality deteriorates
Solution Approach 1:
The patent changes the decision parameter for network selection from automatic fallback to conditional selection based on UE capability and network conditions. When UE supports 5G and network conditions are sufficient, the system selects 5G NR; otherwise, it falls back to LTE EPS, thereby avoiding unnecessary handovers and reducing call setup delays while maintaining reliability.
Solution Approach 2:
The patent introduces feedback mechanisms where the network evaluates UE capabilities and reports network conditions to determine whether to trigger EPS fallback. This feedback loop ensures that fallback is only triggered when necessary, optimizing both call setup time and network reliability.
2Reliability
If EPS fallback is triggered for IMS voice sessions, then network coverage is ensured, but call quality is reduced due to unnecessary handovers
Solution Approach 1:
The patent modifies the network selection criteria by introducing UE capability assessment and network condition evaluation as decision parameters. This prevents unnecessary handovers from 5G to LTE, thereby maintaining call quality while ensuring network coverage through intelligent selection rather than automatic fallback.
3Reliability
If 5G network conditions are insufficient, then voice call reliability is compromised, but triggering EPS fallback causes unnecessary delays
Solution Approach 1:
The patent implements a feedback-based decision mechanism where the network continuously monitors conditions and UE capabilities. When 5G conditions are insufficient, the system receives feedback and triggers EPS fallback; when conditions are sufficient, it maintains 5G connection, thereby optimizing both reliability and call setup efficiency.
Solution Approach 2:
The patent dynamically changes the network selection parameter based on real-time conditions. The system evaluates whether to use 5G NR or LTE EPS by comparing network conditions against thresholds, enabling efficient call setup while ensuring reliability through condition-based decision making.
Data Source
AI summary
Methods, devices, and system related to wireless communications are disclosed. In one example aspect, a method for wireless communication includes receiving, by a first access node in a first type of communication network, a request from a wireless device to establish a voice session with an Internet Protocol Multimedia System (IMS); initiating, by the first access node, an IMS voice session establishment for the wireless device; configuring, by the first access node, a Quality of Service (QOS) for the IMS voice session using a Protocol Data Unit (PDU) session modification request; and determining, in part based on one or more capabilities of the wireless device, to refrain from triggering a fallback to a second type of communication network for the IMS voice session establishment.