5G Voice Call Continuity via Registration Feedback
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Solution Overview
Problem
Current 5G networks lack mechanisms to handle existing voice calls when a wireless device moves into 5G coverage, leading to dropped calls due to the absence of native VoNR support, resulting in increased signaling traffic and resource usage for re-establishment.
Innovation Solution
The method involves sending a registration request to a 5G network, receiving an indication of IMS voice services support, and determining not to transfer existing voice calls if they are not supported, allowing the call to be maintained on the current network or transferred to a supporting 4G/LTE network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device attempts to transfer the existing voice call to the 5G network, then the quality of service for data communication is improved, but the voice call is dropped due to lack of native VoNR support
Solution Approach 1:
The patent applies preliminary action by checking support for existing voice calls during the network registration phase, before the voice call transfer is attempted. The 5G network includes an indication in the registration acceptance message whether it supports existing voice calls, allowing the wireless device to determine in advance whether to proceed with the transfer, thereby preventing call drops.
Solution Approach 2:
The patent implements feedback by providing information from the 5G network to the wireless device about its capability to support existing voice calls. The registration acceptance message includes an indication (such as a flag or parameter) that feedbacks the network's support status, enabling the wireless device to make an informed decision about voice call transfer.
2Loss of information
If the wireless device attempts to transfer the voice call to a network that does not support it, then signaling traffic increases, but call re-establishment resources are consumed
Solution Approach 1:
The patent applies preliminary anti-action by preventing the voice call transfer attempt before it can cause harmful effects. By checking the network's support indication during registration and deciding not to transfer when unsupported, the system avoids generating unnecessary signaling traffic and consuming power on re-establishment procedures.
3Loss of information
If the 5G network provides indication of IMS voice services support, then service availability information is improved, but device complexity increases
Solution Approach 1:
The patent merges the indication of existing voice call support with the existing IMS voice services support indication in the registration acceptance message. By combining these capability indicators into a single messaging framework, the patent provides comprehensive service information without significantly increasing procedure complexity.
Data Source
AI summary
A method is provided for handling a voice call in a heterogeneous network environment by a wireless device. The method includes sending a registration request to a network node in a Next Generation (5G) network. The wireless device has an existing voice call on a different network in the heterogeneous network environment. The method further includes receiving a registration acceptance from the network node in the 5G network. The registration acceptance indicates that IMS voice services are supported, but existing voice calls are not supported. The method further includes determining to stop an attempt to move the existing voice call to the 5G network.