PUCCH Resource Determination for HARQ-ACK Overlap Avoidance
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Solution Overview
Problem
In 5G NR R16 systems, there is no definite scheme for transmitting multiple Physical Uplink Control Channels (PUCCHs) carrying Hybrid Automatic Repeat reQuest Acknowledgements (HARQ-ACK) in a Time Division Multiplexing (TDM) manner when they overlap with other Uplink Control Information (UCI) channels, leading to potential overlapping of HARQ-ACKs that should not overlap.
Innovation Solution
A method for determining a second PUCCH resource that does not overlap with a target PUCCH, or adjusting the PUCCH resource according to a predetermined rule to avoid overlap, including options like symbol removal, time domain shifting, selecting a non-overlapping PUCCH from a resource set, or dropping certain UCI, to ensure TDM transmission of HARQ-ACK and UCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a PUCCH resource for transmitting HARQ-ACK and other UCI is determined when overlap occurs, then the HARQ-ACK and UCI can be transmitted together, but the determined PUCCH resource may overlap with another PUCCH carrying HARQ-ACK, causing unintended HARQ-ACK overlap
Solution Approach 1:
The patent segments the PUCCH transmission by identifying overlapping PUCCHs and separating their handling. When overlap is detected, the method divides the transmission into: (1) PUCCHs that can be transmitted normally, and (2) PUCCHs that require resource adjustment or dropping. This segmentation prevents unintended HARQ-ACK overlap while maintaining UCI multiplexing capability.
Solution Approach 2:
The patent applies preliminary action by detecting PUCCH overlaps before transmission and pre-adjusting resources. The method determines in advance which PUCCHs overlap, identifies the affected HARQ-ACK transmissions, and applies corrective actions (resource reselection or dropping) before the actual transmission occurs, thereby preventing the harmful overlap effect.
2Productivity
If multiple PUCCHs are transmitted in TDM manner in one slot, then resource utilization is improved, but the complexity of determining non-overlapping resources increases
Solution Approach 1:
The patent applies self-service by enabling the terminal to autonomously detect PUCCH overlaps, identify conflicting resources, and perform self-correction through resource reselection or dropping. The network device provides the initial resource allocation, but the terminal independently handles the overlap resolution without requiring complex network coordination, thus reducing overall system complexity while maintaining high transmission efficiency.
3Reliability
If PUCCH resources are adjusted to avoid overlap, then HARQ-ACK transmission reliability is improved, but transmission time or resource flexibility may be reduced
Solution Approach 1:
The patent applies dynamics by providing flexible and adaptive PUCCH resource adjustment. Instead of fixed resource allocation, the method dynamically selects alternative PUCCH resources from configured resource sets when overlap is detected. The terminal can choose from multiple candidate resources, and the specific selection depends on the overlap situation, thereby maintaining reliability while preserving timing flexibility.
Data Source
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AI summary
The present disclosure provides a transmission method, a terminal and a network device. The transmission method includes: when at least one of at least two PUCCHs carrying an HARQ-ACK in one time unit overlaps with a PUCCH carrying target UCI in the time unit, determining a second PUCCH; and transmitting target information on the second PUCCH, the second PUCCH not overlapping with a target PUCCH, the target PUCCH being a PUCCH carrying the HARQ-ACK other than the at least one PUCCH in the time unit, or when the second PUCCH overlapping with the target PUCCH, transmitting the target information in accordance with a predetermined rule. The target information is the HARQ-ACK carried in the at least one PUCCH and the target UCI, or the HARQ-ACK carried in the at least one PUCCH.