Multicast Channel Association Table for Bandwidth Efficiency
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Solution Overview
Problem
In communication networks with multiple shared-media interfaces, redundant copies of multicast groups are often transmitted over multiple channels, leading to inefficient bandwidth usage, as existing methods fail to automatically detect and eliminate duplicate transmissions effectively.
Innovation Solution
A method that involves updating a channel association table based on multicast management messages, such as IGMP, to identify and eliminate redundant channel associations, ensuring that only one channel is used to deliver a multicast group, by selecting the lowest-loaded channel if multiple channels are available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multicast groups are transmitted over multiple channels to serve CPE devices with multiple interfaces, then device connectivity and service availability are improved, but bandwidth efficiency deteriorates due to redundant transmissions
Solution Approach 1:
The system implements feedback by monitoring multicast management messages (IGMP) from CPE devices and maintaining an association table that tracks which CPEs are receiving which multicast groups on which channels. This feedback mechanism enables the network to detect redundant transmissions and dynamically adjust channel assignments to eliminate waste while maintaining service availability.
Solution Approach 2:
The invention changes the parameter of channel assignment dynamically based on current network conditions and CPE device states. By selecting the lowest-loaded channel for each multicast group transmission and updating associations in real-time, the system optimizes bandwidth utilization while ensuring all requesting CPEs receive the multicast traffic.
2Reliability
If redundant copies of multicast groups are transmitted over multiple channels, then service availability to multi-interface CPEs is improved, but bandwidth usage increases inefficiently
Solution Approach 1:
The invention extracts and eliminates redundant multicast transmissions by identifying duplicate channel associations in the association table. When multiple channels are carrying the same multicast group to the same CPE or to CPEs that already have it on another channel, those redundant transmissions are removed, keeping only the necessary transmissions for service availability.
Solution Approach 2:
The system dynamically adjusts multicast channel assignments based on real-time network conditions and CPE device states. The association table is continuously updated as CPEs join or leave multicast groups, and channel selections are made adaptively to minimize redundancy while ensuring service availability, rather than using static assignments.
3Loss of energy
If automatic detection and elimination of duplicate multicast transmissions is implemented, then bandwidth efficiency is improved, but system complexity increases
Solution Approach 1:
The system implements self-service by having CPE devices send IGMP membership reports that automatically inform the network of their multicast reception needs. The network uses this self-reported information to maintain the association table and make intelligent channel assignments without requiring complex external control systems, reducing overall system complexity while improving bandwidth efficiency.
Data Source
AI summary
Multicast management messages associate a channel with one or more multicast groups. The information included in the multicast management messages are combined into a channel association table that may be stored at a CPE device for each of one or more interfaces. The channel association table is used in response to a request for a desired multicast group to select a channel over which the desired multicast group should be delivered. The channel selection is based on a review of the channel association table. If a channel is associated with the desired group, it is selected. If a channel is not associated with the desired group, a channel is selected from a plurality of available channels based on group traffic loading criteria. A multicast message, such as a JOIN, is forwarded to other devices informing them that the desired group should only be sought and/or delivered on the selected channel.