Multicast Profile Switching for Cable Modem Channel Utilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In DOCSIS-based cable access networks, there is a challenge in dynamically switching multicast profiles to maximize channel utilization when a cable modem (CM) joins or leaves a multicast group, as existing solutions do not efficiently manage profile changes to ensure optimal data transmission rates for all group members.
Innovation Solution
A multicast profile switching method and system that includes a profile management module within the CMTS to dynamically switch to a profile with the maximum rate supported by all CMs in a multicast group, by sending a request message and performing tests to ensure all members support the new profile before switching, thereby maximizing channel utilization and providing a better multicast profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the CMTS uses a fixed multicast profile for data transmission, then the system operation is simple and stable, but the channel utilization cannot be maximized when CM members join or leave the multicast group
Solution Approach 1:
The patent implements dynamic profile switching by enabling the CMTS to automatically select and switch between different multicast profiles based on real-time channel conditions and CM member capabilities. The system transitions from a static fixed profile approach to a dynamic adaptive approach where the profile can be changed without manual intervention, thereby maximizing channel utilization while maintaining operational simplicity through automation.
Solution Approach 2:
The patent employs feedback mechanisms where the CMTS receives capability information from CM members and channel condition data, then uses this feedback to intelligently select the optimal multicast profile. The system continuously monitors group member changes and channel quality, and adjusts the profile selection accordingly, creating a closed-loop control system that balances productivity improvement with manageable complexity.
2Productivity
If the CMTS dynamically switches multicast profiles to maximize rate, then channel utilization is maximized, but the system complexity increases due to profile management and switching overhead
Solution Approach 1:
The patent enables the CMTS to autonomously manage profile switching without requiring complex external control mechanisms. The system automatically detects CM member capabilities, evaluates channel conditions, and selects appropriate profiles independently. This self-service approach maximizes data transmission rate while keeping the control mechanism relatively simple by eliminating the need for manual profile management or complex external coordination.
Solution Approach 2:
The patent utilizes parameter changes in multicast profiles (such as modulation schemes, coding rates, and subcarrier configurations) to adapt to varying channel conditions and CM capabilities. By changing these parameters dynamically, the system achieves higher data transmission rates without requiring fundamentally complex switching mechanisms, as the profile structure itself provides the adaptability needed.
3Reliability
If the CMTS tests whether all CM members support a new profile before switching, then transmission reliability is ensured, but the switching time and system overhead increase
Solution Approach 1:
The patent implements preliminary action by having CM members report their profile support capabilities in advance when joining the multicast group or during periodic status updates. The CMTS stores this capability information and uses it for future profile selection decisions. This preliminary capability declaration eliminates the need for time-consuming real-time testing before each profile switch, ensuring reliability while minimizing switching time.
Solution Approach 2:
The patent applies partial action by performing capability verification only when necessary (e.g., when a CM joins, leaves, or when channel conditions significantly change) rather than continuously testing all members before every profile switch. This selective verification approach maintains transmission reliability by checking support when critical changes occur, while avoiding excessive overhead during normal operation when the profile can remain unchanged.
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
Embodiments of the present invention provide a multicast profile switching method. In the method, by using a multicast profile management module, a multicast profile switching request message is received from a cable modem termination system CMTS; a multicast profile having a maximum rate and commonly supported by all current multicast group members is determined; and when the multicast profile having the maximum rate is different from a current multicast profile that is running, a multicast profile switching instruction is sent to the CMTS, where the multicast profile switching instruction is used to instruct the CMTS to perform multicast profile switching. By using the solution in the embodiments, the CMTS can dynamically switch a profile to a profile having a maximum rate and supported by a CM in a multicast group, thereby providing a better multicast profile to the CM and maximizing channel utilization.