Data Centric UE Voice Service Access via CSFB Indication
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Solution Overview
Problem
Data-centric mobile user equipment (UE) cannot access voice services when camped on LTE networks, as they ignore pages and do not use voice solutions, while voice-centric UEs reselect to 2G or 3G for voice services, leading to suboptimal service experiences.
Innovation Solution
The communication network provides additional indications to UEs about service availability, such as a CSFB Supported Indication, allowing data-centric UEs to use CSFB for voice services while voice-centric UEs reselect to alternative RATs, enabling data-centric UEs to remain on LTE and access voice services via CSFB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data-centric UE remains on LTE network without using voice solutions, then data service continuity is maintained, but voice service accessibility deteriorates
Solution Approach 1:
The UE dynamically changes its behavior based on the type of service being accessed. For data services, it remains on LTE network. For voice services, it dynamically triggers CSFB to access circuit switched network, thus adapting to different service requirements while maintaining data continuity and enabling voice accessibility
Solution Approach 2:
The network provides service type indications (data service indication or voice service indication) that change the operational parameters of the UE. Upon receiving a voice service indication, the UE changes its network access behavior from ignoring pages to actively triggering CSFB, thereby enabling voice service while maintaining data service parameters
2Reliability
If voice-centric UE reselects to 2G or 3G for voice services, then voice service quality is improved, but data service efficiency deteriorates
Solution Approach 1:
The UE dynamically selects network access strategy based on service type. For voice services, it reselects to 2G/3G networks to ensure quality. For data services, it remains on LTE network to maintain efficiency, thus dynamically optimizing both voice quality and data efficiency through service-aware behavior
3Productivity
If data-centric UE ignores pages on LTE, then data service performance is maintained, but voice service reception deteriorates
Solution Approach 1:
The network sends service type indications that change the reception parameter of the UE. When a voice service indication is received, the UE changes from ignoring pages to monitoring and responding to pages, enabling voice service reception while maintaining data service performance through service-specific parameter adjustment
Data Source
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AI summary
Methods and apparatus to support voice solutions for data centric terminals are described. An example method includes sending a combined registration request message for at least one evolved packet system service via a first radio access technology, receiving an EPS service registration accept message comprising an indicator that indicates that circuit switched fall back is supported, and when the user equipment has a voice centric setting, reselecting to a second radio access technology.