ACM Profile ID Synchronization for Service Continuity
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Solution Overview
Problem
In adaptive coding and modulation (ACM) systems, synchronizing ACM profile tables between sending and receiving ends is challenging, leading to service interruptions when updates are needed, as different modulation and coding schemes can result in the receiving end being unable to demodulate and decode service information if the tables are not updated simultaneously.
Innovation Solution
Implementing a method where the sending and receiving terminals store and compare ACM profile IDs and corresponding schemes, allowing asynchronous switching by using pre-recorded schemes when IDs match and invoking new schemes from the ACM profile table when they do not, ensuring continuous service transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronous updating of ACM profile tables is implemented at sending and receiving ends, then service continuity is maintained, but system complexity and update coordination difficulty increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple ACM profile tables (first ACM profile table and second ACM profile table) at both sending and receiving ends before updates are needed. When an update is required, the system switches between these pre-configured tables rather than updating in real-time, thereby maintaining service continuity while simplifying the update coordination process.
2Adaptability or versatility
If ACM profile tables are updated asynchronously at sending and receiving ends, then update flexibility is improved, but service interruption occurs due to mismatched modulation and coding schemes
Solution Approach 1:
The patent implements preliminary action by preparing multiple ACM profile tables in advance. When asynchronous updates are performed, both ends switch between the pre-configured tables using the same switching indication, ensuring that even though updates occur at different times, the modulation and coding schemes remain synchronized during the transition, preventing service interruption.
Solution Approach 2:
The patent employs feedback mechanisms where the sending end generates a switching indication based on the current ACM profile table configuration and transmits it to the receiving end. The receiving end uses this feedback information to perform synchronous switching, ensuring that both ends are updated in coordination despite asynchronous table configurations, thereby maintaining service continuity.
3Productivity
If only profile ID is transmitted to save bandwidth, then transmission efficiency is improved, but demodulation failure occurs when ACM profile tables are updated
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple ACM profile tables and maintaining consistent profile ID mappings between sending and receiving ends. When updates occur, the system switches between pre-configured tables while preserving the profile ID consistency, allowing the receiving end to successfully demodulate and decode service information without requiring profile ID changes or additional signaling overhead.
Data Source
AI summary
A method for sending service information includes: judging whether a current ACM profile identifier (profile ID) is consistent with an ACM profile ID recorded in separately-stored coding and modulation information; when the current ACM profile ID is consistent with the ACM profile ID recorded in the separately-stored coding and modulation information, coding and modulating the service information according to the coding and modulation information; when the current ACM profile ID is inconsistent with the ACM profile ID recorded in the separately-stored coding and modulation information, coding and modulating the service information according to an ACM profile table; and sending the coded and modulated service information, where the coded and modulated service information carries the current ACM profile ID.