Mesh Node Groupcast Forwarding via Path Loss Measurement
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Solution Overview
Problem
Dense wireless mesh networks experience performance degradation due to collisions and inefficient resource use caused by redundant transmissions and simultaneous response frames from numerous neighboring nodes.
Innovation Solution
Implementing a frame groupcast system with a transceiver and a groupcast determination module that determines whether to forward a groupcast frame based on measurements such as path loss or distance, reducing redundant broadcasts and optimizing contention windows to minimize collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mesh nodes simultaneously generate and transmit response frames to a groupcast request frame, then all neighboring nodes can respond to the request, but collisions occur among the numerous response frames causing performance degradation
Solution Approach 1:
The patent applies preliminary action by having mesh nodes measure and store path loss values before actual communication occurs. These pre-measured path loss values are used during the communication process to determine transmission parameters, allowing the system to prepare necessary data in advance and avoid collisions during the critical transmission phase.
Solution Approach 2:
The patent implements dynamics by making the contention window size adjustable rather than fixed. The contention window is dynamically modified based on measured path loss values and network conditions, allowing the system to adapt transmission parameters in real-time to optimize both response frame transmission efficiency and collision avoidance.
2Productivity
If mesh nodes retransmit received groupcast frames to relay to peer nodes out of range, then data can be delivered to all nodes, but redundant transmissions occur causing inefficient use of network resources
Solution Approach 1:
The patent applies local quality by having each mesh node individually evaluate its own path loss measurement and determine whether it needs to retransmit the groupcast frame based on its specific local conditions. This allows nodes to selectively forward frames only when necessary, optimizing resource utilization while ensuring complete data delivery.
Solution Approach 2:
The patent implements feedback by having mesh nodes measure path loss values and use this information to make informed decisions about frame retransmission. The measured path loss feedback allows nodes to determine whether they received the frame sufficiently well to forward it, avoiding redundant transmissions while maintaining delivery completeness.
3Device complexity
If mesh nodes use fixed contention window sizes for frame transmission, then the system is simple to implement, but collisions occur more frequently in dense networks reducing performance
Solution Approach 1:
The patent transforms the static contention window into a dynamic parameter that adapts to network conditions. By adjusting the contention window size based on measured path loss values and network density, the system maintains simplicity in implementation while significantly improving communication performance in dense mesh networks.
Solution Approach 2:
The patent applies parameter changes by modifying the contention window parameter based on measured path loss values. This allows the system to change transmission parameters dynamically to match actual network conditions, optimizing collision avoidance while maintaining implementation simplicity through a straightforward modification process.
Data Source
AI summary
A frame groupcast system for a mesh node in a mesh network having a plurality of mesh nodes includes a transceiver that receives a groupcast frame and a groupcast determination module that determines whether to forward the received groupcast frame based on at least one measurement.