HARQ Repetition Bundle Size Feedback Mechanism
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Solution Overview
Problem
In LTE wireless communication systems, coverage enhancement employing repetitions leads to inaccurate channel quality indication (CQI) due to 'out of range' values, resulting in inefficient resource utilization and potential capacity loss or delays, as the base station struggles to estimate the correct bundle size for data transmission.
Innovation Solution
A feedback mechanism is introduced where the data receiving device provides feedback on the successful decoding of data portions, allowing the transmission device to adjust the bundle size by transmitting a reception acknowledgement and bundle length information, enabling the data transmitting device to optimize the number of repetitions for efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coverage enhancement employing repetitions is used, then coverage is improved, but resource utilization efficiency deteriorates due to inaccurate CQI
Solution Approach 1:
The patent introduces a feedback mechanism where the UE reports the determined bundle size (number of repetitions needed for successful decoding) back to the base station. This feedback enables the base station to accurately estimate the required repetitions for future transmissions, resolving the CQI inaccuracy problem while maintaining efficient resource utilization.
2Ease of operation
If a fixed predetermined number of repetitions is used, then transmission simplicity is improved, but system capacity deteriorates due to redundancy or delays
Solution Approach 1:
The patent makes the bundle size dynamic by allowing the UE to determine the actual number of repetitions needed for successful decoding and report this value to the base station. This dynamic adjustment enables the system to adapt to varying channel conditions, eliminating fixed repetition overhead while maintaining transmission simplicity through automated determination.
3Reliability
If bundle size is increased to ensure successful decoding, then reliability is improved, but resource efficiency deteriorates due to redundancy
Solution Approach 1:
The patent changes the parameter of bundle size from a fixed predetermined value to a dynamically determined value based on actual decoding requirements. The UE monitors decoding success after each repetition and adjusts the bundle size parameter accordingly, ensuring minimal redundancy while guaranteeing successful decoding.
4Productivity
If bundle size is decreased to improve resource efficiency, then resource utilization is improved, but reliability deteriorates due to insufficient repetitions
Solution Approach 1:
The patent enables the UE to self-determine the appropriate bundle size by monitoring its own decoding success rate. The UE autonomously adjusts the number of repetitions needed, eliminating the need for conservative over-provisioning by the base station while ensuring reliable decoding through self-optimized resource allocation.
Data Source
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AI summary
The invention relates to transmission and reception of data in a wireless communication system. In particular, the predetermined number of repetitions of the same data portion is transmitted over the wireless interface. The receiving device receives the repetitions, attempts their decoding and checks whether the decoding was successful. If the decoding was successful after the predetermined number of repetitions or less, a positive acknowledgement is generated. In addition, a feedback including a bundle size information is generated and transmitted. The bundle size information includes a number of repetitions, smaller or equal to the predetermined number, after which the decoding was successful. The feedback is transmitted to the data transmitting device which may adapt the predetermined number of repetitions accordingly. The invention enables efficient control of the number of repetitions applied which is particularly advantageous for coverage enhancement purposes.