HARQ Codebook Size Determination for Wireless Feedback
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Solution Overview
Problem
In wireless communication systems, the semi-static HARQ codebook used for transmitting HARQ feedback in downlink transmissions can result in unnecessary overhead due to long transmission delays, especially when the number of configured feedback-enabled HARQ processes is small, leading to redundancy and increased bit overhead.
Innovation Solution
The size of the HARQ codebook is determined based on the number of configured K1 values and feedback-enabled HARQ processes, using the minimum of these two values (min {M, N}) to reduce redundancy and overhead, while maintaining the semi-static characteristic of the codebook, with K1 values indicating time offsets between transmission resources for HARQ feedback and downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the HARQ codebook size is determined based on the number of configured K1 values, then the codebook can cover all possible feedback scenarios, but the codebook size becomes excessively large when the number of feedback-enabled HARQ processes is small, causing unnecessary overhead
Solution Approach 1:
The patent changes the parameter used for codebook size determination from the number of configured K1 values to the minimum of the number of configured K1 values and the number of feedback-enabled HARQ processes. This parameter adjustment allows the codebook size to adapt dynamically to the actual feedback needs, reducing unnecessary overhead while maintaining coverage of all required feedback scenarios.
2Quantity of substance
If the HARQ codebook size is reduced to minimize overhead, then the transmission efficiency improves, but the codebook may no longer cover all necessary feedback scenarios
Solution Approach 1:
By using the minimum of the number of configured K1 values and the number of feedback-enabled HARQ processes as the codebook size parameter, the patent ensures that the codebook is large enough to cover all necessary feedback scenarios while being small enough to minimize overhead. This parameter optimization resolves the contradiction between codebook size reduction and feedback scenario coverage.
Data Source
AI summary
A hybrid automatic repeat request (HARQ) codebook processing method, executed by a terminal, including: determining a size of an HARQ codebook according to a number N of configured K1 values and a number M of configured feedback-enabled HARQ processes, where the HARQ codebook carries an HARQ feedback for a downlink transmission, and the K1 values each indicate a time offset between a transmission resource for the HARQ feedback and a transmission resource for the downlink transmission.