vSRVCC Handover via UE Capability Negotiation
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Solution Overview
Problem
Current SRVCC handover procedures in wireless communication systems face delays and service disruptions during video calls from packet switched networks to circuit switched networks due to lack of negotiation between user equipment and mobile service centers regarding SCUDIF capabilities, leading to inefficient handover processes and potential service fallback issues.
Innovation Solution
A method is introduced where network entities detect the need for a video SRVCC handover and transmit handover requests including UE capabilities, allowing for informed handover decisions based on SCUDIF and bearer capabilities, enabling seamless transitions between packet switched and circuit switched networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional SRVCC handover procedures are used without capability negotiation, then handover can be performed quickly, but service continuity is compromised due to unknown SCUDIF capabilities between UE and MSC
Solution Approach 1:
The patent applies preliminary action by performing capability negotiation during the initial call setup phase between UE and MSC, so that when handover occurs later, both parties already know each other's SCUDIF capabilities. This eliminates the need for delayed negotiation during handover, ensuring both reliability and minimizing time loss.
Solution Approach 2:
The patent uses the initial call setup signaling as an intermediary mechanism to transfer capability information between UE and MSC before handover. This intermediary communication establishes mutual awareness of SCUDIF support, enabling reliable handover decisions without extending handover time.
2Adaptability or versatility
If H.324 call setup procedures are performed with full negotiation, then service compatibility is ensured, but call setup delay increases to 5-8 seconds
Solution Approach 1:
The patent extracts the essential capability negotiation elements from the full H.324 call setup procedure. Instead of performing all H.324 negotiation steps (H.223 Multiplexer level detection, Terminal Capability Exchange, Master Slave determination, etc.), it selectively negotiates only the critical SCUDIF capability during call setup, reducing delay while maintaining necessary compatibility.
Solution Approach 2:
The patent applies partial action by performing only the necessary capability negotiation during call setup rather than the complete H.324 procedure. This partial negotiation suffices to establish SCUDIF capability awareness, avoiding the excessive 5-8 second delay of full H.324 setup while ensuring service compatibility.
3Device complexity
If video call handover from PS to CS network is performed without capability information, then network switching is simplified, but service quality deteriorates due to potential fallback to speech
Solution Approach 1:
The patent applies preliminary action by establishing capability awareness during initial call setup, so that when video call handover from PS to CS network occurs, both UE and MSC already know whether SCUDIF is supported. This eliminates the need for complex runtime capability detection, keeping handover simple while ensuring video call continuity through informed handover decisions.
Data Source
AI summary
A method and system for handover of a video call from a packet switched network to a circuit switched network by a first network entity associated with the packet switched network in a single radio environment is provided. A need to perform a video single radio voice call continuity (vSRVCC) handover from a packet switched network to a circuit switched network is detected during a video call session in the packet switched network. Accordingly, a vSRVCC handover request is transmitted to a second network entity associated with the circuit switched network for performing the vSRVCC handover of the video call session where the vSRVCC handover request includes vSRVCC capabilities of a user equipment (UE) associated with the video call session.