Video Call Continuity During PS to CS Handover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current handover procedures in wireless communication networks, particularly between different radio access technologies like 3G and 4G, face challenges in managing multiple network bearers and ensuring seamless video call continuity, as existing solutions like SRVCC primarily support voice calls and lack efficient management of video and multimedia data.
Innovation Solution
A method and system for managing network bearers during handover, which involves identifying application sessions, generating unique identifiers for bearers, and sending video SRVCC capabilities to Network Elements, enabling efficient handover from Packet Switched to Circuit Switched networks while managing voice and video bearers effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing SRVCC handover procedures are used, then voice call continuity is supported, but video call continuity and multimedia data management are not supported
Solution Approach 1:
The patent segments the handover procedure into distinct phases: video capability detection, bearer identification, and selective handover execution. The network identifies video bearers separately from voice bearers using bearer identifiers and QoS parameters, allowing independent handling of video and voice services during handover between PS and CS networks
Solution Approach 2:
The patent implements preliminary action by detecting video SRVCC capabilities and identifying video bearers before initiating handover. The network performs capability exchange and bearer identification in advance, preparing the necessary information (bearer IDs, QoS parameters) before the actual handover event, ensuring video continuity can be maintained
2Adaptability or versatility
If multiple network bearers are managed during handover, then video and voice services can be maintained, but system complexity increases
Solution Approach 1:
The patent applies universality by using a unified handover management mechanism that handles both voice and video bearers through common procedures. The same handover signaling framework and bearer management logic are used for both service types, reducing the need for separate complex management systems while maintaining multi-service support
Solution Approach 2:
The patent introduces intermediary elements (bearer identifiers, QoS parameter sets, capability indicators) that mediate between the complex multi-bearer state and the simplified handover control. These intermediaries allow the network to track and manage multiple bearers without increasing control plane complexity, as the intermediaries encapsulate the necessary information in standardized message formats
3Reliability
If video SRVCC capabilities are implemented, then video call continuity is achieved, but signaling overhead increases
Solution Approach 1:
The patent merges video SRVCC capability signaling with existing handover and capability exchange procedures. Video capability indicators are combined with voice SRVCC capability messages, and video bearer identification uses the same signaling framework as voice bearer management. This consolidation reduces separate signaling messages while maintaining video continuity support
Data Source
AI summary
A method and system for managing a plurality of network bearers in a wireless communication network is provided. The method includes identifying at least one of an initiation or an update of an instance of an application session. The method then generates an identifier associated with said instance of the application session. Further, the method assigns said identifier to each of the plurality of network bearers established as a result of said identified initiation or identified update of said instance of the application session. In an embodiment, the method uses the said identifier for managing communication during handover from a first communications network to a second communications. The method manages both video bearers and the voice bearers during the handover based on the said identifier.