ICS Session Media Change via ICCF Call Leg Reestablishment
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Solution Overview
Problem
Current mobile communication networks, particularly those based on circuit-switched (CS) technology, lack the ability to dynamically change media types during an ongoing call, limiting user experience and requiring extensive network upgrades to support media type changes as defined by Release 5 (R5) by 3GPP.
Innovation Solution
A method and device for changing ICS session media by releasing and reestablishing CS call legs between a terminal equipment and a CS control function, and updating the media type of a second call leg, allowing for media type changes without the need for large-scale network upgrades, using mechanisms like SCUDIF and media negotiations via ICCC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If CS network is used to establish ICS call, then network compatibility and ease of operation are improved, but the ability to change media type during call is lost
Solution Approach 1:
The patent introduces an IMS CS control function (ICCF) as an intermediary entity that mediates between the CS network and IMS network. The ICCF receives media type change requests from the terminal equipment, translates them into appropriate signaling commands, and coordinates the reestablishment of call legs with updated media types. This intermediary enables media type changes in CS-based ICS calls by bridging the functional gap between legacy CS network and modern IMS capabilities.
2Adaptability or versatility
If R5 standard is implemented to support media type changes, then adaptability is improved, but device complexity and construction cost increase
Solution Approach 1:
The patent segments the media type change functionality into a separate IMS CS control function (ICCF) entity rather than requiring comprehensive upgrades across the entire CS network infrastructure. By isolating the intelligence needed for media type changes in the ICCF, the solution allows legacy MSC and terminal equipment to operate without modification, significantly reducing deployment complexity and construction costs while still enabling R5-compliant media type changes.
3Adaptability or versatility
If CS call leg is reestablished to change media type, then media type change capability is improved, but call interruption and loss of time occur
Solution Approach 1:
The patent implements preliminary actions by having the ICCF prepare and coordinate the reestablishment of CS call legs with the new media type before completely terminating the old call leg. The control function manages the transition sequence to minimize the gap between old and new call legs, thereby reducing call interruption time while still achieving the necessary media type change.
Data Source
AI summary
A method for changing ICS session media includes: receiving a media type change request including a new media type sent from a terminal equipment or a MSC, releasing a CS call leg based on an original media type between an ICCF and the terminal equipment, establishing a CS call leg based on the new media type between the ICCF and the terminal equipment, and updating a media type of a second call leg between the ICCF and a second party into the new media type; or, receiving a media type change request including a new media type sent from a second party, updating a media type of a second call leg between an ICCF and the second party into the new media type, releasing a CS call leg based on an original media type between the ICCF and a terminal equipment, and establishing a CS call leg based on the new media type between the ICCF and the terminal equipment.