Data Block Transmission Using Reliable ACK Classification
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Solution Overview
Problem
In enhanced general packet radio service (EGPRS) networks, the fast acknowledged/not acknowledged reporting (FANR) scheme leads to increased frequency of undetected errors due to weaker CRC protection, causing false positives in acknowledgments, which can result in unnecessary retransmissions and window synchronization issues, leading to stalled transmissions.
Innovation Solution
A method and device that receive and react to multiple types of acknowledgments, with different error tendencies, allowing for the classification of acknowledgments as reliable or unreliable based on their characteristics, and using this information to manage data block transmission and retransmission effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fast acknowledged/not acknowledged reporting (FANR) is implemented to increase reporting frequency, then transmission speed is improved, but error detection reliability deteriorates due to weaker CRC protection
Solution Approach 1:
The patent introduces an intermediary verification mechanism where the transmitting device checks whether the receiving device actually has data blocks to acknowledge before processing acknowledgement bits. This intermediary check prevents false positive interpretations of acknowledgement signals, resolving the reliability issue introduced by FANR's weaker CRC protection while maintaining its speed benefits
Solution Approach 2:
The patent implements a feedback mechanism where the transmitting device monitors the consistency between received acknowledgement signals and the actual transmission state. When inconsistencies are detected (such as acknowledging blocks that weren't transmitted), the system adjusts its interpretation of subsequent acknowledgements, creating a self-correcting feedback loop that maintains reliability despite reduced CRC strength
2Productivity
If weaker CRC protection is used in FANR to reduce overhead, then transmission efficiency is improved, but false positive rate increases
Solution Approach 1:
The patent applies a dynamic interpretation approach where the meaning of acknowledgement bits is not fixed but adapts based on the current transmission state. The transmitting device dynamically adjusts its understanding of acknowledgement signals by cross-referencing with its own transmission buffer state, allowing efficient processing of weak CRC signals while preventing false positives through context-aware interpretation
Solution Approach 2:
The patent performs preliminary verification by checking whether the receiving device could possibly have data to acknowledge before interpreting acknowledgement bits. This preliminary action prevents false positives by establishing contextual validity upfront, allowing the system to use weaker CRC protection without sacrificing reliability
3Device complexity
If acknowledgement processing is simplified to reduce complexity, then device complexity is reduced, but error handling capability deteriorates
Solution Approach 1:
The patent implements self-service error handling where the transmitting device uses its own transmission state information to verify the validity of received acknowledgements. Instead of requiring complex external verification mechanisms, the system serves its own error detection needs by cross-checking acknowledgements against its transmission buffer, reducing complexity while maintaining robust error handling
Solution Approach 2:
The patent uses feedback from the transmitting device's own transmission state to validate received acknowledgements. This internal feedback mechanism provides sophisticated error handling without requiring complex external verification systems, achieving reliable error handling with minimal additional complexity
Data Source
AI summary
A method of transmits a data block of a type from a transmitting device (for example a transmitting network node) to a receiving device (for example a receiving network node), in particular during a temporary block flow. A transmitting device is capable of receiving at least two different types of positive/negative acknowledgements for data blocks of said type from said receiving device and the reaction of the transmitting device to the positive/negative acknowledgements depends on the type of the said received positive/negative acknowledgement.