MAC Forwarding Protocol for Wireless Link Quality
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Solution Overview
Problem
Wireless networks face challenges in maintaining quality of service when link quality degrades due to factors like object movement or blockages, as current routing protocols prioritize hop-count over link quality, leading to increased latency and intolerable service.
Innovation Solution
A method is introduced to improve quality of service by selecting and establishing an alternate forwarding path between devices using a MAC forwarding frame that includes specific addresses and error correction, allowing for dynamic path adjustments and efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If routing protocols utilize hop-count to determine transmission path, then direct transmissions between neighbor devices are enforced, but quality of service becomes intolerable when link quality degrades
Solution Approach 1:
The patent changes the routing metric from hop-count to link quality-based metrics. The source device selects forwarding devices based on measured link quality parameters (signal strength, packet loss rate, etc.) rather than simply counting hops, allowing the routing decision to adapt to actual link conditions and maintain quality of service even when direct links degrade
Solution Approach 2:
The patent implements dynamic path selection where the source device continuously monitors link quality and adjusts the forwarding path in real-time. When link quality degrades below a threshold, the source device dynamically switches from direct transmission to alternate paths through selected forwarding devices, and can further adjust the path as conditions change
2Reliability
If other metrics are used to select transmission path between neighbors, then quality of service can be maintained, but extensive processing time is required increasing latency
Solution Approach 1:
The source device performs preliminary actions by pre-selecting and caching one or more forwarding devices based on current link quality measurements before actual data transmission is needed. When transmission is required, the device can immediately use the pre-selected forwarding path without performing complex real-time calculations, thus reducing latency while maintaining quality of service
Solution Approach 2:
The patent applies partial action by selecting only the necessary number of forwarding devices (one or more) based on current needs rather than evaluating all possible paths. The source device can select a single best forwarding device or multiple backup devices depending on the situation, avoiding excessive processing while ensuring quality of service is maintained
3Adaptability or versatility
If routing protocols operate in the network layer, then comprehensive path selection is possible, but additional processing time is required for forwarding frames
Solution Approach 1:
The patent moves the routing functionality from the traditional network layer to the MAC layer, creating a new dimension in the protocol stack architecture. This allows routing decisions to be made at a lower layer where frame forwarding already occurs, eliminating the need for separate network layer processing and reducing overall forwarding time while maintaining adaptability through MAC-layer path selection
Data Source
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AI summary
A method (300) for improving quality of service of a wireless link between a source device and a destination device by forwarding frames on an alternate path between the source device and destination device. The method comprises selecting by the source device at least one forwarding device to be included on the alternate forwarding path; constructing a medium access control (MAC) forwarding frame (200) to include at least an address of the at least one forwarding device (S310); and transmitting the MAC forwarding frame to a forwarding device next to the source device (S320).