UE Network Selection for VoIP and CSFB Service Continuity
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Solution Overview
Problem
Current mobile communication systems face challenges in providing high-speed services due to resource limitations, and users experience degraded data service quality when switching to 2G/3G networks for voice call continuity, as these networks have lower transmission rates compared to LTE networks.
Innovation Solution
The implementation of an apparatus and method in a user equipment (UE) that adaptively selects the access network for voice and data services by detecting network capabilities and performing combined attach or tracking area update procedures to differentiate between voice over Internet Protocol (VoIP) or circuit switched fall back (CSFB) support, allowing the UE to switch between LTE and 2G/3G networks based on service requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE switches to 2G/3G networks for voice call continuity, then voice service is maintained, but data service quality deteriorates due to lower transmission rates
Solution Approach 1:
The patent segments the network selection process by differentiating between voice service requirements and data service requirements. The UE independently selects access networks for voice services (using CSFB or VoLTE) and data services (using LTE), rather than switching the entire connection to 2G/3G networks. This allows voice service continuity to be maintained through appropriate network selection while data services continue to utilize high-speed LTE networks.
2Speed
If the UE uses LTE network for high-speed data service, then data transmission rate is improved, but voice service continuity becomes challenging due to resource limitations
Solution Approach 1:
The patent introduces network capability detection and selective access network selection as intermediary mechanisms. The UE detects whether the LTE network supports VoLTE services and whether 2G/3G networks are available for CSFB. Based on this detection, the UE appropriately selects voice service access networks while maintaining data service on LTE networks, resolving the conflict between high-speed data transmission and voice service continuity.
3Reliability
If the UE performs network switching for voice service, then voice call continuity is maintained, but service quality deteriorates due to suboptimal network selection
Solution Approach 1:
The patent implements feedback mechanisms through network capability detection. The UE actively detects and determines whether the network supports VoLTE or CSFB services before selecting the access network for voice services. This feedback-driven approach ensures that the UE selects the most appropriate network based on actual network capabilities, thereby maintaining both voice call continuity and high service quality without unnecessary or suboptimal network switching.
Data Source
AI summary
A method for receiving a service by a user equipment (UE) is provided. The method includes transmitting an attach request message to a network, upon detection of entry into an area of a non-legacy mobile communication system, receiving an attach accept message from the network including information indicating whether the network supports VoIP or CSFB and receiving voice service by the VoIP or the CSFB through the non-legacy mobile communication system if the information included in the attach accept message indicates that the network supports the VoIP or the CSFB.