HARQ Feedback Codebook Control During Cell DTX/DRX Inactive Periods
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Solution Overview
Problem
In cell DTX/DRX mechanisms, unnecessary HARQ feedbacks lead to resource waste due to the terminal's HARQ feedback according to existing solutions.
Innovation Solution
A terminal determines a HARQ feedback codebook based on the inactive period of cell DTX or DRX, optimizing HARQ feedback by reducing unnecessary feedbacks and resource waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the terminal performs HARQ feedback according to the existing solution in cell DTX/DRX mechanism, then the HARQ feedback is sent, but unnecessary HARQ feedbacks cause resource waste
Solution Approach 1:
The patent dynamically adjusts the HARQ feedback behavior based on the terminal's DRX state. When the terminal is in the on-duration period, it sends HARQ feedback normally. When in the off-duration period, it suspends or cancels HARQ feedback. This dynamic adaptation to changing operational states resolves the contradiction by making the system flexible rather than static, reducing resource waste during off periods while maintaining feedback capability during on periods.
Solution Approach 2:
The patent changes the operational parameters of HARQ feedback based on the DRX configuration. Specifically, it modifies the feedback timing and availability by introducing the concept of on-duration and off-duration periods. During off-duration, the HARQ feedback parameter is effectively changed to 'suspended' or 'cancelled', which reduces resource consumption without compromising the essential feedback function during active periods.
2Quantity of substance
If the terminal sends HARQ feedback during inactive period of cell DTX/DRX, then the feedback is transmitted, but it causes resource waste due to unnecessary feedback
Solution Approach 1:
The patent applies preliminary action by pre-configuring the DRX parameters (on-duration, off-duration, periodicity) before the HARQ feedback transmission occurs. The terminal uses these pre-established parameters to determine in advance whether to send feedback during a given period. This preliminary configuration allows the system to avoid unnecessary feedback transmissions proactively, rather than reacting after the fact, thereby reducing resource waste effectively.
Solution Approach 2:
The patent extracts the HARQ feedback transmission from the continuous operation and separates it into discrete periods based on DRX configuration. By taking out the feedback mechanism from a continuous state and placing it only in the on-duration periods, the system eliminates feedback transmissions during off-duration periods. This extraction approach directly reduces the quantity of feedback resources used while maintaining essential communication functionality.
3Reliability
If the terminal performs HARQ feedback without considering DTX/DRX inactive periods, then the feedback is sent, but it leads to resource waste
Solution Approach 1:
The patent introduces a feedback mechanism about the DRX state itself. The terminal determines its DRX state (on-duration or off-duration) and uses this state information to control HARQ feedback transmission. This nested feedback loop ensures that HARQ feedback is only transmitted when the terminal is in a state capable of reliable reception and processing, thereby maintaining reliability while avoiding waste during inactive periods.
Data Source
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AI summary
The present application belongs to the technical field of communications. Disclosed are a hybrid automatic repeat request (HARQ) feedback method and apparatus, and a terminal. The HARQ feedback method in the embodiments of the present application comprises: a terminal determining, according to first information, an HARQ feedback codebook sent on the basis of a target physical uplink control channel (PUCCH) occasion, wherein the first information comprises a non-activation time of discontinuous transmission (DTX) of a target cell or discontinuous reception (DRX) of the target cell, and the target cell comprises an access cell of the terminal.