PUCCH Resource Identification from Repeated PDCCH CCE Positions
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Solution Overview
Problem
In next-generation wireless communication systems, there is ambiguity in identifying a resource for transmitting physical uplink control channel information due to the repetition of physical downlink control channel candidates with different aggregation levels, leading to uncertainty in determining the starting control channel element (CCE) for PUCCH resource allocation.
Innovation Solution
The user equipment identifies the PUCCH resource based on a CCE index corresponding to a starting CCE of a PDCCH candidate, considering factors such as aggregation level, repetition, and relative starting CCE positions within control resource sets, to resolve ambiguity and ensure accurate resource allocation.
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 applies preliminary action by establishing clear PUCCH resource identification rules before the ambiguity problem occurs. The network configures multiple PDCCH candidates with different aggregation levels in advance, and the UE is provided with predetermined rules to identify the starting CCE index for PUCCH resource allocation. This prevents the ambiguity from arising in the first place, allowing the system to maintain both high reliability through repetition and clear resource identification.
2Reliability
If multiple PDCCH candidates with different aggregation levels are configured, then coverage and reliability are enhanced, but complexity of resource allocation increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the aggregation level parameter of PDCCH candidates while maintaining a structured approach to resource identification. Different aggregation levels (e.g., AL4, AL8, AL16) are configured for different PDCCH candidates, but the starting CCE index parameter serves as a consistent reference point for PUCCH resource allocation. This allows the system to enhance reliability through parameter diversity while managing complexity through parameter consistency in resource identification.
3Productivity
If PUCCH resource is identified based on starting CCE index, then resource allocation efficiency is improved, but ambiguity arises when multiple PDCCH candidates share the same starting CCE
Solution Approach 1:
The patent applies segmentation by dividing the PDCCH candidate set into distinct segments or groups, each with identifiable characteristics. When multiple PDCCH candidates share the same starting CCE index, the system segments them by aggregation level or by their position in the candidate list. The UE is configured to identify a specific segment (e.g., the first candidate with a certain aggregation level, or the candidate in a specific search space set) to determine the PUCCH resource, thereby resolving the ambiguity while maintaining allocation efficiency.
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.