Early Bit Indication for Wireless Frame Decoding
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Solution Overview
Problem
In wireless communications, especially in high-efficiency WLANs like IEEE 802.11ax, receiving devices face challenges in decoding data frames due to unknown repeated fields, which cause noise and interference, as they are unaware of repeated fields until decoded, leading to wasted opportunities and interference with adjacent channels.
Innovation Solution
The implementation of an early bit indication system that analyzes the length field in data frames to determine if fields are repeated in the time or frequency domains, using remainder values and piggybacked bits encoded via binary phase shift keying modulation to inform the receiving device about field repetitions, allowing for enhanced decoding reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiving device decodes data frames without prior knowledge of repeated fields, then the device can process data in real-time, but decoding reliability deteriorates due to noise and interference from unknown repeated fields
Solution Approach 1:
The patent applies preliminary action by embedding early bit indications in the L-SIG field before the actual data transmission. These early bits provide advance information about field repetitions, allowing the receiving device to prepare appropriate decoding strategies beforehand. This preliminary information prevents noise and interference issues during the actual decoding process, as the receiver now knows which fields will be repeated and can properly handle them.
2Loss of time
If the device waits to identify repeated fields until decoding, then device complexity is reduced, but time is lost due to wasted decoding opportunities
Solution Approach 1:
The early bit indication mechanism performs the identification of repeated fields in advance, during the L-SIG field transmission phase. By encoding repetition information in these early bits, the system eliminates the need for post-decoding analysis, thus recovering wasted time without significantly increasing device complexity. The receiving device simply reads the early bits and applies the indicated decoding strategy.
Solution Approach 2:
The L-SIG field acts as an intermediary that carries early bit indications about field repetitions. This intermediary structure provides the receiving device with advance knowledge without requiring complex real-time analysis during the main data decoding process. The L-SIG field mediates between the transmitter's intent to repeat fields and the receiver's need to decode efficiently.
3Loss of information
If early bit indications are encoded using remainder values and piggybacked bits, then information about field repetitions is provided accurately, but the length field complexity increases
Solution Approach 1:
The L-SIG length field is made multi-functional by using it to carry both its traditional length information and additional early bit indications about field repetitions. By encoding repetition information within the existing length field structure using remainder values and piggybacked bits, the system avoids creating separate dedicated fields. This universal use of the length field provides comprehensive information without significantly increasing overall frame structure complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables the receiving device to identify repeated fields before decoding, reducing uncertainty and interference, thereby enhancing decoding reliability and minimizing wasted opportunities in multi-channel transmissions.
Implementation Method 1
piggybacked bits encoded via binary phase shift keying modulation to inform the receiving device about field repetitions
Data Source
AI summary
This disclosure describes methods, apparatus, and systems related to early bit indication system. A device may identify a high efficiency frame in accordance with a high efficiency communication standard, received from a first device, the high efficiency frame including at least in part a legacy signal field and a high efficiency signal field. The device may determine a length field included in the legacy signal field. The device may determine one or more bits included in the length field. The device may determine a repeated high efficiency signal field based at least in part on the one or more bits.