Control Frame Duration Correlation for NAV Accuracy
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Solution Overview
Problem
Current network technologies rely on accurate decoding of control frames to maintain network allocation vectors, leading to inaccurate NAVs if decoding fails, which can result in inefficient power consumption and increased data collisions due to frequent medium sampling.
Innovation Solution
Implementing virtual carrier sensing using the duration of a control frame to convey network allocation information, allowing nodes to update their NAVs without decoding the control frame content, and using a mapping function to correlate NAV-frame duration with data-frame duration for accurate preoccupation time calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nodes frequently sample the medium to update network allocation vectors, then carrier sensing accuracy is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by having nodes perform physical carrier sensing in advance to determine medium availability before data transmission. This preliminary sensing allows nodes to set accurate NAV values based on predicted transmission durations, reducing the need for frequent subsequent sampling and lowering power consumption while maintaining sensing accuracy.
Solution Approach 2:
The patent replaces frequent mechanical sampling operations with a computational approach using NAV (Network Allocation Vector) mechanisms. Instead of continuously physically sampling the medium, nodes use pre-computed NAV values derived from control frame durations to determine when to sample, substituting physical sampling with virtual time-based scheduling that reduces energy consumption.
2Measurement precision
If nodes decode control frames to update network allocation vectors, then NAV accuracy is improved, but decoding failures can result in inaccurate NAVs
Solution Approach 1:
The patent applies copying by having receiving nodes create copies of the NAV (Network Allocation Vector) information from control frames without requiring full decoding of the entire control frame content. The receiving node copies only the essential NAV update information needed to determine medium reservation duration, allowing accurate NAV updates even when complete frame decoding fails or is unnecessary.
Solution Approach 2:
The patent extracts only the critical NAV information from control frames rather than requiring complete frame decoding. By extracting and processing only the essential duration and reservation information needed for NAV updates, the system maintains NAV accuracy and reliability while reducing the impact of potential decoding failures on overall system performance.
3Use of energy by moving object
If nodes use virtual carrier sensing with network allocation vectors, then power consumption is reduced, but frequent sampling is still required to maintain accurate NAVs
Solution Approach 1:
The patent applies dynamics by making the carrier sensing mechanism adaptive rather than static. Nodes dynamically adjust their sampling behavior based on NAV values and medium reservation status, transitioning between frequent sampling (when NAV indicates potential conflicts) and infrequent sampling (when medium is clearly available). This dynamic approach maintains medium access efficiency while significantly reducing average power consumption compared to continuous sampling.
Data Source
AI summary
Methods and apparatus for transmitting a signal having a first frame duration being correlated to a second frame duration are described herein.