PUCCH Resource Identification Under Repeated PDCCH Candidates
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Solution Overview
Problem
In next-generation wireless communication systems, there is ambiguity in identifying a physical uplink control channel (PUCCH) resource due to the repetition of physical downlink control channel (PDCCH) candidates with different aggregation levels, leading to uncertainty in determining the starting control channel element (CCE) for PUCCH transmission.
Innovation Solution
The user equipment (UE) identifies the PUCCH resource based on a control channel element (CCE) index corresponding to a starting CCE of a PDCCH candidate, considering factors such as aggregation level, repetition, and relative starting CCE positions to resolve ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH candidates are repeated with different aggregation levels, then reliability of control channel reception is improved, but ambiguity in identifying PUCCH resource increases
Solution Approach 1:
The patent introduces a PUCCH resource indicator (PRI) field in the downlink control information (DCI) as an intermediary element that directly points to the specific PUCCH resource. This mediator resolves the ambiguity caused by multiple PDCCH candidates with different aggregation levels by providing a clear, unambiguous reference to the intended PUCCH resource, eliminating the need for complex CCE index calculations that lead to identification conflicts.
2Ease of operation
If PUCCH resource is determined based on starting CCE index, then resource identification method is simplified, but errors increase when PDCCH candidates are repeated
Solution Approach 1:
The patent uses a dedicated PRI field in DCI that is specifically created for this purpose - to indicate the PUCCH resource. This disposable indicator field is included in each DCI message and directly provides the PUCCH resource information without requiring the UE to perform complex calculations based on CCE indices, thereby eliminating errors while maintaining simplicity.
3Reliability
If multiple PDCCH candidates with different aggregation levels are used, then coverage and reliability are improved, but device complexity increases
Solution Approach 1:
The patent extracts the PUCCH resource indication from the complex CCE index calculation process and places it directly in the DCI message as a PRI field. This separation allows the UE to simply read the PRI value from the DCI without needing to analyze multiple PDCCH candidates or perform complex calculations, thereby reducing device complexity while maintaining the reliability benefits of multiple aggregation levels.
Data Source
AI summary
Aspects relate to transmission of physical uplink control channel (PUCCH) information. A user equipment may receive a first physical downlink control channel (PDCCH) candidate carried by a control resource set that also carries a second PDCCH candidate, where these PDCCH candidates are associated with different aggregation levels. The user equipment may identify a PUCCH resource for transmission of information (e.g., an ACK or a NACK) that is associated with a physical downlink shared channel (PDSCH) transmission scheduled by the first PDCCH candidate. For example, the user equipment may identify the PUCCH resource based on a control channel element (CCE) index that corresponds to a starting CCE of the first PDCCH candidate and the second PDCCH candidate.