Enhanced Acknowledgment for Wireless Decoding Failures
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Solution Overview
Problem
Current wireless communication systems lack enhanced acknowledgment mechanisms to effectively handle situations where only the PHY preamble is received, failing to provide detailed information on decoding failures, which hampers link adaptation and rate adaptation algorithms.
Innovation Solution
An enhanced acknowledgment system that allows stations to respond with a block acknowledgment (BA) even when the MAC payload is not correctly decoded, including additional information on in-device coexistence issues or unavailability, by adding specific fields in the PHY header or signal fields of Wi-Fi frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a station sends a block acknowledgment only when MAC payload is correctly decoded, then the acknowledgment mechanism remains simple, but detailed feedback on decoding failures is lost, hampering link adaptation and rate adaptation algorithms
Solution Approach 1:
The patent implements an enhanced feedback mechanism where the station sends a block acknowledgment frame even when MAC payload decoding fails. The feedback includes specific failure reason codes (e.g., header error, length error, FCS error, no MPDU found) that provide detailed information about decoding failures. This enables the access point to adjust link adaptation and rate adaptation algorithms based on precise failure information rather than losing the feedback entirely.
Solution Approach 2:
The patent modifies the block acknowledgment frame structure by adding a failure reason field that changes the parameter set included in the acknowledgment. Instead of a simple success/failure indication, the frame now includes specific error type parameters that convey detailed decoding failure information. This parameter enhancement allows richer feedback without fundamentally changing the acknowledgment mechanism's operation.
2Reliability
If additional fields are added to the PHY header or signal fields to include failure reasons, then detailed decoding failure information is provided, but the frame structure becomes more complex
Solution Approach 1:
The patent segments the feedback information by placing failure reason codes in specific designated fields within the block acknowledgment frame structure. Rather than adding unstructured data, the failure information is segmented into defined code values that map to specific error types. This structured segmentation maintains frame organization while enabling detailed feedback on decoding failures, thereby improving reliability without excessive complexity.
3Measurement precision
If the station responds with block acknowledgment upon receiving PHY preamble even with MAC payload decoding failure, then link adaptation accuracy improves, but the processing requirements and complexity increase
Solution Approach 1:
The patent applies preliminary action by having the station prepare and send the block acknowledgment frame as soon as the PHY preamble is successfully decoded, even before MAC payload decoding is complete or has failed. The station pre-allocates the acknowledgment resources and populates the failure reason field based on the decoding attempt outcome. This preliminary response action ensures that link adaptation receives timely feedback without requiring complex post-processing or delayed responses.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to enhanced acknowledgment. A device may identify a physical layer (PHY) convergence protocol data unit (PPDU) received from an Access point (AP), wherein the PPDU comprises a header and a payload. The device may generate a failure of decoding the payload. The device may generate an acknowledgment indicating the failure and indicating additional information to assist the AP in determining a failure reason. The device may cause to send the acknowledgment to the AP.