CBMS Streaming Handover via SDP and ESG Data Models
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Solution Overview
Problem
In Convergence of Broadcast and Mobile Services (CBMS) systems, terminals face significant delays when handover or roaming occurs during file download or streaming, as they need to restart the reception process from a new source, which is inefficient and time-consuming.
Innovation Solution
The solution involves providing essential information for seamless handover or roaming through new Session Description Protocol (SDP) and Electronic Service Guide (ESG) data models, notification messages, and query messages that include access information, such as IP addresses, frequencies, and FEC algorithms, to enable continuous file download or streaming by identifying and accessing similar services at new reception sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal restarts the reception process from a new source after handover or roaming, then the terminal can continue receiving services at the new reception source, but it takes a considerable amount of time to restart the reception
Solution Approach 1:
The patent applies preliminary action by having the terminal store reception information (including service identification information and access information) from the current reception source before handover occurs. This stored information is then reused after handover to immediately access the same service at the new reception source, eliminating the need to restart the reception process from scratch and significantly reducing handover time.
Solution Approach 2:
The patent uses copying by creating a copy of the reception information from the current reception source and storing it in the terminal. This copied information includes service identification information that can be used to identify similar services at the new reception source, allowing the terminal to quickly re-establish service reception without retrieving all information anew.
2Loss of time
If the terminal stores reception information including access information for each reception source, then the terminal can quickly access services after handover, but the memory capacity requirement increases
Solution Approach 1:
The patent applies taking out by extracting only the essential reception information needed for handover from the complete service data. Specifically, it stores service identification information (which service is being received) and access information (how to access the service), while not storing redundant data. This selective extraction reduces memory requirements while still enabling fast handover.
Solution Approach 2:
The patent performs preliminary action by pre-storing only the critical handover information (service identification and access information) before handover occurs. This preliminary preparation of minimal necessary data allows quick handover execution without requiring large memory capacity, as only essential parameters are retained rather than complete service datasets.
Data Source
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AI summary
Apparatuses and methods for handover or roaming during a file download or streaming. A streaming roaming method in a Convergence of Broadcast and Mobile Services (CBMS) system includes generating a Session Description Protocol (SDP), a fragment, or a notification message indicating streaming roaming or handover information, and transmitting the SDP, the fragment, or the notification message to a terminal.