Data Link Layer Error Correction for Wireless Reliability
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Solution Overview
Problem
In wireless communication systems, particularly with the IEEE 802.11 standard, there is a lack of error correction mechanisms at the data link layer (L2), leading to unnecessary retransmissions and potential loss of real-time properties during high-definition moving image distribution, as errors in the L1 layer are not effectively corrected, preventing acknowledgement transmission and subsequent retransmissions.
Innovation Solution
Incorporating determination information in the data transmission to determine whether to pass data to a higher layer at the data link layer, using redundancy signals for error correction within the data link layer, and including this information in frames such as LLC/SNAP or action frames, allowing for appropriate error correction and reduced retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error correction is performed only at L1 layer using IEEE 802.11 standard, then device complexity is reduced, but reliability deteriorates due to unnecessary retransmissions at higher layers
Solution Approach 1:
The patent segments the error correction function into two distinct layers: L1 layer error correction using conventional IEEE 802.11 mechanisms, and L2 layer error correction using the newly introduced determination information. This segmentation allows each layer to handle specific types of errors independently, improving overall reliability without requiring a complete redesign of the error correction system.
Solution Approach 2:
The patent adds a new dimension to error correction by introducing determination information at the L2 layer, which enables receivers to identify and correct errors before passing data to higher layers. This dimensional addition (L2 layer error correction capability) resolves the contradiction by providing enhanced reliability without fundamentally changing the L1 layer structure.
2Reliability
If retransmission is performed at L2 layer when code error is not corrected, then reliability is improved, but loss of time occurs due to real-time property degradation
Solution Approach 1:
The patent implements preliminary error correction at the L2 layer by including determination information that allows receivers to identify and correct errors before data needs to be retransmitted. This preliminary action prevents the need for time-consuming retransmission cycles, thereby maintaining real-time properties while improving communication reliability.
Solution Approach 2:
By enabling error correction at L2 layer through determination information, the system can skip the retransmission step for correctable errors, rushing through the error handling process efficiently. This skipping mechanism preserves real-time properties by avoiding the time loss associated with traditional retransmission protocols.
3Reliability
If determination information is included in transmitted data, then error correction capability is improved, but device complexity increases due to additional processing requirements
Solution Approach 1:
The patent extracts the essential error correction capability from complex L3 layer processing and implements it at the L2 layer through determination information. This extraction allows error correction to be performed with simpler L2 layer processing, improving reliability without proportionally increasing overall system complexity.
Solution Approach 2:
The determination information acts as an intermediary element that enables error correction at L2 layer without requiring complex processing at higher layers. This intermediary mechanism provides the needed error correction capability while keeping processing requirements manageable by confining the complexity to a specific, well-defined function.
4Productivity
If L2 layer error correction is implemented, then productivity is improved by reducing retransmissions, but ease of operation deteriorates due to configuration complexity
Solution Approach 1:
The patent designs the determination information mechanism to be universally applicable across different data transmission scenarios. By creating a multi-functional error correction approach that works with various data types and transmission conditions, the system improves productivity through reduced retransmissions while maintaining ease of operation through standardized, versatile configuration.
Data Source
AI summary
Data communication is performed appropriately.An information processing apparatus includes a control unit. In a case of transmitting data by using wireless communication, the control unit performs control of performing transmission while including determination information with which a device in a transmission destination of the data determines in a data link layer whether to pass the data to a higher layer of the data link layer into the data. Also, in a case of receiving data by using wireless communication, the control unit performs control of determining whether to pass the data to a higher layer of a data link layer on the basis of information included in the data (determination information that can be grasped in data link layer).