HARQ Feedback Power Control via Group-Based DAI Counting
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Solution Overview
Problem
In wireless communications systems, user equipment (UE) faces challenges in accurately implementing power control for feedback messages, leading to inefficient communications and reduced battery life due to difficulties in calculating the number of information bits for group-based HARQ feedback.
Innovation Solution
The UE calculates the number of information bits based on received DCI messages, including terms related to missed DCI messages and received transport blocks, to accurately identify transmission power for feedback messages, enabling reliable and efficient power control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits feedback for multiple groups of downlink transmissions, then the communication reliability is improved, but the power control accuracy deteriorates
Solution Approach 1:
The patent divides the feedback into separate groups based on downlink transmission groups, with each group having its own DAI counting process. The UE calculates the number of information bits for each group independently and transmits them in separate feedback messages. This segmentation allows accurate power control for each group while maintaining overall communication reliability across multiple groups.
2Measurement precision
If the UE calculates the number of information bits for group-based HARQ feedback, then the power control accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent performs preliminary actions by configuring the UE with group-based feedback parameters and DAI counting rules before actual feedback transmission. The UE pre-calculates the number of information bits for each group based on configured parameters, and the base station pre-configures the feedback structure. This preliminary setup simplifies the real-time calculation process while maintaining accurate power control.
3Duration of action of moving object
If the UE transmits feedback using accurate power control, then the battery life is extended, but the feedback transmission reliability may be reduced
Solution Approach 1:
The patent implements dynamic power control where the UE adjusts transmission power based on the calculated number of information bits for each feedback group. The power control is dynamic and adapts to the actual feedback content and requirements. This dynamic approach ensures sufficient power for reliable transmission while avoiding excessive power consumption, thereby extending battery life without compromising feedback reliability.
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AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive first downlink control information corresponding to a first group of downlink transmissions and second downlink control information corresponding to a second group of downlink transmissions. The UE may calculate a number of information bits for a feedback message including first feedback for one or more downlink transmissions of the first group and second feedback for one or more downlink transmissions of the second group. The number of information bits may include first information bits of the first feedback and second information bits of the second feedback. The UE may identify a transmission power for the feedback message based on the calculated number of information bits. The UE may transmit the feedback message including the first feedback and the second feedback using the identified transmission power.