Wireless Retransmission Redundancy Version Selection for Noisy Channels
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Solution Overview
Problem
In wireless communication, existing error correction methods are inadequate for reliably transmitting data over noisy channels, particularly in scenarios where retransmissions are necessary due to decoding failures, acknowledgement failures, or pre-emption scenarios, as they lack a flexible and adaptive approach to selecting appropriate redundancy versions.
Innovation Solution
A hybrid redundancy version design is implemented, which defines multiple redundancy versions suitable for different retransmission scenarios, allowing for the selection of the most appropriate version based on the specific retransmission scenario, using a communication system that includes a first electronic device and a second electronic device configured to transmit wireless signals and perform retransmissions. This design utilizes a circular buffer to form multiple redundancy versions, including pre-defined and dynamically defined versions based on the last transmission, to enhance error correction and data reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single redundancy version is used for all retransmissions, then the system complexity is reduced, but the reliability of data transmission in different retransmission scenarios deteriorates
Solution Approach 1:
The patent segments the retransmission process by defining multiple redundancy versions (RV0, RV1, RV2, RV3) with different starting positions in the circular buffer. Each redundancy version is specifically designed for different retransmission scenarios (initial transmission, first retransmission, second retransmission, third retransmission), allowing the system to select the most appropriate version based on the specific scenario, thereby improving transmission reliability without requiring complex adaptive algorithms.
Solution Approach 2:
The patent applies preliminary action by pre-defining multiple redundancy versions with different characteristics before transmission begins. The circular buffer is pre-configured with encoded bits at different positions, and each redundancy version is predetermined for specific retransmission scenarios. This eliminates the need for real-time complex decision-making during retransmission, reducing system complexity while maintaining high reliability.
2Reliability
If multiple redundancy versions are defined for different retransmission scenarios, then the reliability of data transmission is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific redundancy versions to specific retransmission scenarios based on their characteristics. RV0 is optimized for initial transmission with full redundancy, while subsequent RVs (RV1, RV2, RV3) are optimized for different retransmission scenarios with progressively different starting positions in the circular buffer. This localized optimization ensures each scenario receives the most appropriate redundancy version, improving decoding success rate while keeping the selection rule simple (based on scenario type).
Solution Approach 2:
The patent changes the parameter of redundancy version selection by introducing scenario-based rules instead of fixed version usage. The system dynamically selects which redundancy version to use based on the retransmission scenario (initial transmission, first retransmission, second retransmission, third retransmission), where each scenario has a predetermined optimal redundancy version. This parameter change approach improves reliability without requiring complex real-time adaptation, as the selection is based on simple scenario classification.
3Productivity
If adaptive redundancy version selection is implemented, then the productivity of error correction is improved, but the ease of operation deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring the mapping between retransmission scenarios and redundancy versions before operation begins. The system establishes predetermined rules that automatically select the appropriate redundancy version based on the detected scenario type. This eliminates the need for manual configuration or complex real-time optimization, improving error correction efficiency while maintaining ease of operation through automatic scenario-based selection.
Solution Approach 2:
The patent implements self-service by enabling the system to automatically detect the retransmission scenario and select the appropriate redundancy version without external intervention. The scenario detection mechanism automatically identifies whether this is an initial transmission, first retransmission, second retransmission, or third retransmission, and the system autonomously selects the corresponding redundancy version (RV0, RV1, RV2, or RV3). This self-service approach improves error correction efficiency while keeping the system easy to operate, as no manual configuration is required.
Data Source
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AI summary
Aspects of the disclosure provide an apparatus that includes transmitting circuit and processing circuit. The transmitting circuitry is configured to transmit wireless signals. The processing circuitry is configured to encode a set of information bits with a code that is configured for incremental redundancy to generate a code word that includes the information bits and parity bits, buffer the code word in a circular buffer, determine a start position in the circular buffer based on a redundancy version that is selected from a plurality of redundancy versions based on a scenario evaluation of a previous transmission associated with the set of information bits, and transmit, via the transmitting circuitry, a selected portion of the code word from the start position.