A/N Feedback Segmentation for LTE TDD Retransmission
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Solution Overview
Problem
In 3GPP LTE TDD systems, the logical AND operation for A/N bundling leads to inefficient system transmission efficiency and throughput, as errors in one sub-frame result in re-transmission of all data, without accurately identifying the faulty sub-frame.
Innovation Solution
A method and UE module for determining reserved resources, dividing A/N information into bit groups, and selecting N transmission resources and corresponding modulation symbols to accurately transmit multiple A/N information, allowing for precise error identification and reduced unnecessary re-transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If A/N bundling with logical AND operation is used, then the system supports multiple frequency bands and sub-frames, but transmission efficiency decreases because errors in one sub-frame cause re-transmission of all data
Solution Approach 1:
The patent segments the bundled A/N feedback into multiple independent parts, each corresponding to a specific sub-frame or frequency band. Instead of using a single logical AND operation that bundles all A/N information together, the invention divides the feedback into separate groups that can be independently decoded. This allows the base station to identify which specific sub-frame or frequency band contains an error, enabling selective re-transmission rather than re-transmitting all data, thus resolving the contradiction between supporting multiple bands/sub-frames and maintaining transmission efficiency
2Device complexity
If A/N bundling with logical AND operation is used, then the feedback mechanism is simple, but error identification precision is lost as the base station cannot determine which sub-frame contains an error
Solution Approach 1:
The patent introduces an additional dimension to the feedback mechanism by organizing A/N information into multiple groups or layers. Each group corresponds to different sub-frames or frequency bands, creating a multi-dimensional feedback structure. This allows the base station to identify errors with higher precision by examining which specific group contains the NACK, while keeping the overall feedback mechanism relatively simple through structured grouping and selective reporting
Data Source
AI summary
A method and a base station of transmitting a data block are provided. At least one data block is transmitted via at least one of at least two downlink frequency bands. A modulation symbol and N spreading sequences are received. Acknowledgement/negative acknowledgement (A/N) information is determined in accordance with the modulation symbol and the N spreading sequences. The modulation symbol and the N spreading sequences jointly determine the A/N information. And the at least one data block may be retransmitted depending on the A/N information determined.