UE Voice Service Selection in Evolved Packet Systems
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Solution Overview
Problem
In communication systems, particularly in LTE networks, there is a challenge in delivering voice services when the VoIMS indicator is absent, leading to unclear routing of mobile-terminated calls between IMS and CS domains, and issues arise when multiple voice solutions are active, such as VoLGA and IMS, without proper integration or fallback mechanisms.
Innovation Solution
A method is introduced where a user equipment (UE) assesses VoIMS support indicators and adjusts its behavior to select the appropriate voice solution based on network and user settings, using SIP requests and responses to determine the best domain for voice services, and employs CS fallback or VoLGA when IMS is not supported, ensuring seamless voice service delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE always attempts to use IMS for voice services, then voice service quality is improved through IP-based transmission, but service reliability deteriorates when VoIMS indicator is absent or network does not support IMS voice
Solution Approach 1:
The patent implements dynamic voice solution selection by having the UE change its behavior based on real-time network conditions. The UE dynamically adjusts between IMS and CS fallback mechanisms based on the VoIMS indicator and network capabilities, allowing flexible adaptation to varying network environments rather than sticking to a single fixed voice delivery method
Solution Approach 2:
The patent utilizes parameter changes by monitoring the VoIMS indicator status and network capabilities to determine the appropriate voice delivery mode. The system changes operational parameters (voice solution selection, routing decisions) based on detected network conditions, enabling reliable voice service delivery across diverse network configurations
2Adaptability or versatility
If multiple voice solutions (VoLGA, IMS, CS fallback) are deployed simultaneously, then voice service coverage is improved, but system complexity increases due to lack of integration and fallback mechanisms
Solution Approach 1:
The patent merges multiple voice solutions (VoLGA, IMS, CS fallback) into a unified selection framework. The UE integrates these separate voice delivery mechanisms and combines them with network capability information to create a cohesive decision-making process that automatically selects the appropriate solution based on current network conditions
Solution Approach 2:
The patent implements feedback mechanisms where the UE continuously monitors network capabilities and VoIMS indicator status, then uses this feedback information to adjust voice solution selection. This closed-loop approach ensures that the complexity of multiple voice solutions is managed through intelligent, condition-based routing decisions
3Measurement precision
If the network provides comprehensive voice service indicators, then call routing accuracy is improved, but network signaling overhead increases
Solution Approach 1:
The patent extracts only the essential VoIMS indicator information from comprehensive network capability signaling. Rather than processing all available network parameters, the system focuses on extracting and acting on the critical VoIMS indicator that determines voice delivery capability, thereby achieving accurate routing decisions with reduced signaling processing
Data Source
AI summary
A system and method for enabling voice services using a network component in a communication system including a user equipment (UE) is provided. The UE is configured to receive a first message which may be a SIP request. The network component is configured to create a second message, or SIP request, based upon the first message. The network component further configured to subsequently receive a SIP response and select a subsequent action upon receiving the SIP response.