Pre-FEC Padding Mechanism for Wireless PHY Payload Optimization
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Solution Overview
Problem
The existing Forward Error Correction (FEC) padding mechanisms in wireless communication systems, particularly in IEEE 802.11 standards, result in a high padding ratio for small data payload sizes, leading to performance degradation due to inefficient use of bandwidth and increased error rates.
Innovation Solution
Implementing a pre-FEC padding mechanism that adjusts the Modulation and Coding Scheme (MCS) index and channel bandwidth, along with an LDPC extra segment, to minimize the padding ratio by determining optimal padding parameters and ensuring they do not exceed a predefined threshold, thereby optimizing data field processing settings for reduced padding and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing FEC padding mechanisms are used, then error correction is provided, but padding ratio becomes high for small payloads causing performance degradation
Solution Approach 1:
The patent implements dynamic padding adjustment by determining the number of padding bits based on the actual payload size and selecting appropriate MCS indices and channel bandwidths. The system transitions from static fixed padding to dynamic adaptive padding that adjusts to payload characteristics, thereby reducing unnecessary padding for small payloads while maintaining adequate protection for larger ones.
Solution Approach 2:
The patent changes multiple parameters simultaneously including padding length, MCS index, and channel bandwidth to optimize the trade-off between error correction and bandwidth efficiency. By coordinating these parameter changes together, the system achieves better performance than adjusting any single parameter in isolation.
2Reliability
If high padding ratio is used, then error correction coverage is improved, but transmission efficiency decreases
Solution Approach 1:
The patent applies partial padding rather than excessive fixed padding. The padding length is calculated based on the actual payload size requirements and selected MCS parameters, applying only the necessary amount of padding to achieve adequate error correction without the waste associated with excessive fixed padding approaches.
3Ease of manufacture
If fixed MCS index is used, then modulation is simplified, but link adaptation capability is reduced
Solution Approach 1:
The patent implements dynamic MCS selection based on payload size and channel conditions. The system automatically selects appropriate MCS indices from available options, transitioning from static fixed MCS to dynamic adaptive MCS that adjusts to actual transmission requirements, thereby maintaining link adaptation capability while managing complexity through structured decision logic.
Data Source
AI summary
For example, a wireless communication Station (STA) may be configured to determine a data field processing setting for a data field of a Physical Layer (PHY) Protocol Data Unit (PPDU) such that a padding parameter value corresponding to the data field processing setting does not exceed a padding parameter threshold, wherein the data field processing setting includes at least one of a Modulation and Coding Scheme (MCS) index or a channel Bandwidth (BW) setting, wherein the padding parameter value corresponding to the data field processing setting is based on a number of pre Forward Error Correction (FEC) (pre-FEC) pad bits according to the data field processing setting; and to encode the data field according to a FEC coding using the number of pre-FEC pad bits according to the data field processing setting.