PUSCH HARQ-ACK Feedback Overlap Handling in Wireless Nodes
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Solution Overview
Problem
The challenge in wireless communication systems is handling multiple NACK-only based HARQ-ACK feedbacks in the same Physical Uplink Control Channel (PUCCH) slot, particularly addressing time-domain overlap issues between PUCCHs and Physical Uplink Shared Channels (PUSCHs, which affects transmission efficiency and scheduling flexibility.
Innovation Solution
A method is introduced where multiple PUCCHs are configured for different decoding results, with specific rules for resource allocation and feedback transmission based on time-domain overlap, ensuring that ACK/NACK feedback is transmitted correctly and efficiently, even when PUCCHs overlap with PUSCHs, by using a unified solution applicable to various scenarios like uplink, downlink, and sidelink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple different PUCCHs are configured for multiple different decoding results, then HARQ-ACK feedback capability is improved, but time-domain overlap with PUSCH occurs causing transmission conflict
Solution Approach 1:
The patent merges the transmission of HARQ-ACK feedback and data into a single PUSCH when time-domain overlap is detected. Instead of maintaining separate PUCCH channels for different decoding results, the system combines these functions into one unified transmission opportunity, eliminating the time-domain conflict and ensuring both feedback and data are transmitted efficiently without resource waste.
Solution Approach 2:
The PUSCH is designed to serve multiple functions simultaneously: it transmits both the data payload and the HARQ-ACK feedback information. This multi-functionality allows the system to handle multiple decoding results without requiring separate dedicated channels, thereby resolving the transmission conflict while maintaining full feedback capability.
2Measurement precision
If multiple PUCCHs are used for different decoding results, then feedback accuracy is improved, but scheduling flexibility is reduced due to time-domain overlap constraints
Solution Approach 1:
The system dynamically adjusts the transmission method based on the detected time-domain overlap condition. When overlap is detected, the system dynamically switches to using PUSCH for combined transmission; when no overlap exists, it uses traditional PUCCH methods. This dynamic adaptation maintains feedback accuracy while preserving scheduling flexibility under varying conditions.
3Reliability
If separate PUCCH channels are configured for different decoding results, then reliability of feedback transmission is improved, but device complexity increases
Solution Approach 1:
The patent extracts the HARQ-ACK feedback transmission function from the separate PUCCH channels and integrates it into the PUSCH transmission process. By removing the need for multiple dedicated feedback channels and consolidating the function into the existing data channel, the system maintains reliable feedback transmission while significantly reducing the complexity of channel configuration and management.
Data Source
AI summary
A first receiver receives a first information group and a target bit block set, the first information group used to determine X1 control resources; a first transmitter transmits a first PUSCH in a first resource pool; the X1 control resources are respectively reserved for X1 PUCCHs, at least one of the X1 PUCCHs being a PUCCH for NACK-only feedback; when there exists one control resource among the X1 control resources overlapping with the first resource pool in time domain, the first PUSCH is used to transmit ACK/NACK feedback for bit block(s) in the target bit block set; when each of the X1 control resources is orthogonal to the first resource pool in time domain, at most X2 PUCCH(s) among the X1 PUCCHs is(are) used to transmit HARQ-ACK feedback for the bit block(s) in the target bit block set, X2 being a positive integer less than X1.