PUCCH Resource Mapping from Pre-Puncturing CORESET CCEs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems with reduced channel bandwidths, the determination of PUCCH resources becomes ambiguous due to puncturing of resource blocks in the CORESET, leading to discrepancies between base station and terminal interpretations of PUCCH resources.
Innovation Solution
The method involves determining PUCCH resources based on Control Channel Elements (CCEs) before puncturing, using a PUCCH Resource Indicator (PRI) field in Downlink Control Information (DCI) and considering the number of CCEs and the first CCE index in the CORESET, with configurations being either common or dedicated, to resolve ambiguity and improve HARQ-ACK feedback reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a CORESET based on an existing defined size (e.g., 24 RBs) is reused for PDCCH transmission and reception, then the existing CORESET structure can be maintained, but the PUCCH resource determined by the base station may be different from the PUCCH resource determined by the terminal due to puncturing considerations
Solution Approach 1:
The patent applies preliminary action by determining the PUCCH resource based on the CCE index in the original CORESET configuration before puncturing is applied. This allows the base station and terminal to both use the same reference point (the original CCE indexing) to determine the PUCCH resource, eliminating the ambiguity that would arise if puncturing were considered during resource determination. The puncturing is applied after the PUCCH resource is already determined, thus maintaining consistency between base station and terminal.
2Productivity
If the base station determines N_CCE and n_CCE by considering puncturing, then the PUCCH resource can be optimized for the actual transmitted PDCCH, but the terminal may determine N_CCE and n_CCE without the puncturing, leading to different PUCCH resources
Solution Approach 1:
The patent extracts the PUCCH resource determination process from the puncturing operation. By determining the PUCCH resource based on the CCE index in the original CORESET (before puncturing), the patent separates the resource determination step from the puncturing step. This ensures that both base station and terminal use the same reference (original CCE indexing) regardless of whether puncturing is applied, maintaining alignment while still allowing puncturing to be applied for transmission optimization.
3Ease of manufacture
If the channel bandwidth is reduced to support cost-effective UE types, then the deployment cost is reduced, but the PUCCH resource determination becomes ambiguous due to puncturing of CORESET resource blocks
Solution Approach 1:
The patent applies preliminary action by establishing the PUCCH resource determination rule based on the original CORESET configuration before any bandwidth reduction or puncturing effects are applied. This provides a clear, unambiguous reference point that works regardless of the actual channel bandwidth or puncturing patterns, simplifying the determination process for reduced-bandwidth UEs while maintaining consistency with the base station.
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
A method performed by a terminal according to an embodiment of the present disclosure includes receiving a PDCCH based on a CORESET and transmitting a PUCCH based on a PUCCH resource. DCI related to the PDCCH includes a PRI field. The PUCCH resource is determined based on i) a value of the PRI field, ii) a number of CCEs in the CORESET, and iii) an index of a first CCE for reception of the PDCCH among the CCEs. The CCEs in a CORESET are obtained before puncturing related to the CORESET.