Compact HARQ-ACK Feedback with PUCCH Resource Selection
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Solution Overview
Problem
Misunderstandings in wireless communication systems regarding HARQ-ACK feedback due to incorrect interpretation of PUCCH resource indication and HARQ-ACK feedback size lead to improper retransmission of missing transmission blocks.
Innovation Solution
Implementing a preset rule for configuring HARQ-ACK feedback size equal to or less than 4 bits and using PUCCH resources based on a predefined table for HARQ-ACK feedback transmission, especially when UE is configured with G-RNTIs, to ensure accurate reporting and retransmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the HARQ-ACK feedback size is configured to be equal to or less than 4 bits for G-RNTI configured UEs, then the feedback transmission efficiency is improved, but the risk of misinterpretation between schedule data and reported information increases
Solution Approach 1:
The patent segments the HARQ-ACK feedback into different bit positions with specific meanings. The first bit indicates whether the feedback corresponds to the last TB, while subsequent bits indicate the position of the first NACK. This segmentation allows compact 4-bit feedback to convey precise information about missing TBs, resolving the contradiction between compact feedback and accurate interpretation.
Solution Approach 2:
The patent implements a feedback mechanism where the UE reports the position of the first NACK bit in the HARQ-ACK feedback. This feedback about the feedback structure itself allows the BS to accurately determine which TBs need retransmission, eliminating misinterpretation while maintaining efficient 4-bit feedback format.
2Device complexity
If the UE reports HARQ-ACK feedback without proper configuration of feedback size and rules, then the device complexity is reduced, but the accuracy of identifying missing TBs deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with the HARQ-ACK feedback size (equal to or less than 4 bits) and the interpretation rules before actual feedback transmission. This preliminary configuration simplifies the UE's processing complexity while ensuring accurate missing TB identification through the predefined feedback structure and NACK position indication.
3Loss of time
If the base station uses conventional HARQ-ACK feedback interpretation methods, then the processing time is reduced, but the retransmission efficiency deteriorates due to misunderstandings
Solution Approach 1:
The patent uses feedback to improve processing efficiency by having the UE explicitly indicate the position of the first NACK bit. This feedback mechanism allows the BS to quickly identify which TBs need retransmission without complex processing, thereby reducing processing time while improving retransmission efficiency through accurate missing TB identification.
Data Source
AI summary
A wireless communication method includes receiving, from a base station, the one or more signalings, where the one or more signalings are used to configure a user equipment (UE) to transmit a HARQ-ACK feedback according to a preset rule and/or to configure a size of the HARQ-ACK feedback in a case that the size of the HARQ-ACK feedback is equal to or less than 4 bits and/or when the UE is configured with one or more G-RNTIs (Group Radio Network Temporary Identities); and transmitting the HARQ-ACK feedback via a PUCCH resource selected according to the preset rule.