IMS Voice Session Routing via Packet Switched Networks
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Solution Overview
Problem
IMS communication networks often restrict terminals from using IMS voice sessions over packet switched capable radio access networks unless they support emergency session-related data transmission, limiting optimal terminal capability utilization and user experience.
Innovation Solution
A control node sends instruction information to terminals to execute IMS voice sessions over packet switched capable radio access networks regardless of emergency session data transmission support, allowing terminals to use IMS voice sessions and emergency voice sessions without regard to network support for emergency data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal is restricted to use IMS voice session only when the network supports emergency session data transmission, then network regulatory compliance is improved, but terminal capability utilization deteriorates
Solution Approach 1:
The patent segments the voice session functionality into two independent paths: IMS voice sessions can be executed regardless of emergency session support status, while emergency voice sessions have separate routing logic. The control node sends instruction information that divides terminal capabilities into usable IMS voice functions and emergency voice functions, allowing each to operate independently based on network support.
Solution Approach 2:
The control node acts as an intermediary that receives capability information from the terminal, determines network support status for emergency sessions, and sends instruction information back to the terminal. This intermediary resolves the contradiction by mediating between terminal capabilities and network restrictions, enabling IMS voice sessions even when emergency session support is absent.
2Adaptability or versatility
If the terminal attempts to initiate emergency voice sessions over packet switched network without network support, then emergency communication availability is improved, but session establishment time deteriorates due to lengthy attempts
Solution Approach 1:
The terminal performs preliminary capability assessment by receiving instruction information from the control node before attempting emergency voice sessions. This preliminary action provides advance knowledge of network support status, allowing the terminal to pre-determine the appropriate network path (packet switched or circuit switched) and avoid futile attempt sequences, thereby reducing session establishment time.
Solution Approach 2:
The patent implements dynamic path selection where the terminal can switch between packet switched and circuit switched networks based on real-time instruction information from the control node. This dynamic adaptation allows the system to optimize emergency voice session routing based on current network conditions and capabilities, improving both availability and establishment time.
Data Source
AI summary
A communication network comprises a packet switched domain associated with a packet switched capable radio access network and supports an Internet Protocol Multimedia Subsystem voice session via the packet switched capable radio access network. The terminal supports an Internet Protocol Multimedia Subsystem voice session via the packet switched capable radio access network and an Internet Protocol Multimedia Subsystem emergency voice session via the packet switched capable radio access network. A method is executed by a control node of the packet switched domain and comprises sending instruction information to the terminal. The instruction information instructs the terminal to execute an Internet Protocol Multimedia Subsystem voice session via the packet switched capable radio access network without regard to whether the communication network has indicated support of an emergency session related data transmission via the packet switched capable radio access network and the packet switched domain.