Mesh Node Multicast Traffic Management via Dynamic TTL Adjustment
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Solution Overview
Problem
Current IP multicast routing protocols in wireless mesh networks, such as DVMRP and PIM, face challenges with network scaling and inefficient packet forwarding due to the default time-to-live (TTL) parameter being set to one hop, leading to insufficient multicast packet delivery.
Innovation Solution
A node-directed multicast traffic management system that includes a central server generating rules for mesh nodes to adjust the TTL parameter based on channel state information, using a rules-based engine and Netfilter framework to manage multicast traffic, allowing for dynamic adjustment of the TTL parameter and packet ordering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the default TTL parameter is set to one hop, then packet forwarding is simplified, but multicast packet delivery range is insufficient
Solution Approach 1:
The patent implements dynamic TTL adjustment by introducing a rules-based engine that modifies the static TTL parameter based on real-time channel state information. The system transitions from a fixed default TTL of 1 to a dynamic value that adapts to network conditions, allowing multicast packets to traverse the appropriate number of hops while maintaining operational simplicity through automated rule-based control.
Solution Approach 2:
The core solution involves changing the TTL parameter value dynamically based on channel state. The rules-based engine receives channel state information and adjusts the TTL parameter accordingly, transforming it from a static default value to a variable parameter that optimizes multicast delivery range while preventing excessive forwarding.
2Length of moving object
If TTL is increased to extend multicast range, then packet delivery range improves, but network scalability deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where channel state information is continuously monitored and fed back to the rules-based engine. This feedback loop enables the system to adjust TTL values dynamically based on actual network conditions, preventing excessive multicast forwarding while maintaining adequate delivery range. The feedback-driven approach automates complex decision-making, preserving network scalability.
Solution Approach 2:
The rules-based engine acts as an intermediary between channel state information and TTL parameter adjustment. This intermediary layer processes channel state data according to predefined rules and determines appropriate TTL values, eliminating the need for complex manual configuration and maintaining network scalability while achieving extended multicast delivery range.
3Quantity of substance
If multicast packets are forwarded extensively, then packet delivery coverage improves, but bandwidth wastage increases
Solution Approach 1:
The patent applies partial action by adjusting TTL to the precise value needed for effective multicast delivery rather than using excessive forwarding. The rules-based engine calculates appropriate TTL values based on channel state, ensuring packets are forwarded far enough to reach intended recipients without unnecessary additional hops that would waste bandwidth.
Data Source
AI summary
Systems and related methods include node directed management of multicast traffic within a wireless mesh network. A wireless mesh network may include a plurality of mesh nodes and a central server in communication with at least one of the mesh nodes of the plurality of mesh nodes. The central server may be configured to generate one or more rules for at least one of the mesh nodes to instruct a change in a pre-routing parameter in a packet header based on received channel state information. The central server may include a rules-based engine configured to generate and convey one or more traffic shaping rules in response to sensing traffic conditions. The position of received multicast packets in a packet order may be modified.