IMS Service Handover Control for Seamless Video Telecommunication
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Solution Overview
Problem
Conventional service handover technologies in IP-based wireless access networks fail to provide end-to-end service handover, leading to limitations in call quality and resource wastage, particularly when terminals move between different wireless access networks with varying bandwidths, preventing seamless video telecommunication and inefficiently utilizing larger bandwidth networks.
Innovation Solution
A service handover control apparatus and method that collects and utilizes information about terminals to generate control signals for managing handovers between multiple wireless access networks, ensuring optimal network selection based on call conditions, bandwidth, and resource availability, thereby enabling end-to-end service handover and reducing resource wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional handover is performed to prevent call cutting-off, then call continuity is maintained, but end-to-end service handover cannot be provided and call quality deteriorates
Solution Approach 1:
The patent segments the handover process into two independent components: basic handover (for call continuity) and service handover (for service quality). The basic handover ensures call continuity by maintaining connectivity, while the service handover separately manages service quality by selecting appropriate networks based on terminal capabilities and network conditions. This segmentation allows both call continuity and service quality to be optimized independently without conflict.
Solution Approach 2:
The patent performs preliminary service handover before actual handover execution. The control apparatus determines the target network for service handover in advance by evaluating terminal capabilities, current service requirements, and network conditions. This preliminary determination ensures that when handover occurs, the terminal is already directed to the appropriate network for optimal service quality, preventing service degradation during the transition.
2Adaptability or versatility
If terminal is limited to speech telecommunication due to receiving terminal's network constraints, then service compatibility is maintained, but video telecommunication cannot be performed even when transmitting terminal is in a capable network
Solution Approach 1:
The patent introduces a control apparatus as an intermediary between the transmitting and receiving terminals. This control apparatus collects information about both terminals' network capabilities and conditions, then makes intelligent decisions about service handover. The intermediary resolves the compatibility issue by identifying when the receiving terminal can actually support video telecommunication despite initial constraints, and orchestrates the handover to enable the higher-capability service without requiring both terminals to be simultaneously constrained.
3Reliability
If terminal in large bandwidth network performs handover to small bandwidth network, then service continuity is maintained, but network resources are unnecessarily wasted
Solution Approach 1:
The patent implements a feedback mechanism where the control apparatus continuously monitors network conditions, terminal capabilities, and service requirements. Based on this feedback, the control apparatus dynamically determines whether handover is necessary and selects the optimal target network. The system feedbacks information about terminal capabilities and network conditions to make informed handover decisions, preventing unnecessary handovers from large bandwidth networks to small bandwidth networks while ensuring service continuity when handover is required.
Data Source
AI summary
A service handover control apparatus and a method using the apparatus are provided. The service handover control apparatus includes a service handover management unit collecting information associated with a transmitting terminal and a wireless access network, which operate based on an Internet Protocol multimedia subsystem (IMS), and outputting a control signal which controls service handovers of the transmitting terminal and the receiving terminal based on the collected information; and a service handover controller providing the service handover management unit with the information associated with the transmitting terminal and the receiving terminal, and controlling the service handovers of the transmitting terminal and the receiving terminal based on the control signal.