Gateway IGMP Join Filtering for Fast Channel Change Latency
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Solution Overview
Problem
During a Fast Channel Change (FCC) in television systems, there is a significant delay before signal/traffic is received from the last channel, as the system processes multiple join and leave requests, causing end-users to wait several seconds for service to resume.
Innovation Solution
Implementing a gateway device that automatically detects FCC via a configured interval and ignores subsequent IGMP join requests within that interval, only reporting the first and last channel changes, thereby skipping middle channel changes, which reduces the waiting time for downstream traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gateway device processes all IGMP join requests during Fast Channel Change, then channel switching accuracy is maintained, but service resumption time increases significantly
Solution Approach 1:
The patent extracts and removes intermediate IGMP join requests from the processing sequence during Fast Channel Change. The gateway device identifies FCC events and selectively filters out join requests for channels that are not the final destination, allowing only the first and last channel change requests to be processed. This extraction principle directly reduces the number of processing operations while maintaining the accuracy of reaching the correct final channel.
Solution Approach 2:
The gateway device performs preliminary detection of Fast Channel Change events by monitoring IGMP join request patterns. When a configured interval between consecutive join requests is detected (indicating FCC), the device proactively prepares to filter subsequent requests. This preliminary identification allows the system to switch from normal processing mode to FCC optimization mode, reducing service resumption time while maintaining reliability.
2Loss of information
If the gateway device reports all channel changes during FCC, then complete channel transition information is provided, but downstream traffic delivery is delayed
Solution Approach 1:
The patent applies the extraction principle by removing intermediate channel transition information from the reporting sequence during FCC. The gateway device selectively reports only the first and last channel changes, filtering out middle channel transitions. This reduces the volume of control plane traffic and accelerates downstream traffic delivery while preserving the essential information needed for complete channel transition.
Solution Approach 2:
The device performs partial reporting of channel changes by providing only the critical first and last transitions rather than complete intermediate steps. This partial action is sufficient for maintaining service continuity and user experience during FCC, while excessively detailed reporting of every intermediate channel change would unnecessarily delay traffic delivery.
3Measurement precision
If the gateway device processes every join request individually, then processing accuracy is maintained, but processing speed decreases
Solution Approach 1:
The patent merges multiple intermediate IGMP join requests into a single processing operation during FCC. Instead of handling each join request separately, the gateway device consolidates them by identifying the FCC pattern and processing only the boundary channel changes (first and last). This merging principle dramatically increases processing speed while maintaining accuracy by focusing on the critical transition points.
Solution Approach 2:
The device performs preliminary analysis of join request patterns to identify FCC events before processing individual requests. By detecting the configured interval pattern in advance, the gateway device prepares to apply batch processing rules, switching from individual request handling to pattern-based filtering. This preliminary action enables faster processing while preserving the accuracy of reaching the correct final channel.
Data Source
AI summary
Methods, systems, and computer readable media described herein can be operable to facilitate different reporting treatment for certain join requests received during a fast channel change. A gateway device may automatically detect the FCC (Fast Channel Change) via a configured interval. The gateway device may be configured such that if a subsequent IGMP (Internet group management protocol) join request was received within the configured interval since a previous join request, the previous join request may be ignored. According to the configuration of the gateway device, in a FCC, only the first channel and the last channel are reported, and the middle channel changes may be ignored.