PDCCH Candidate Reference Selection in Overlapping Search Spaces
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Solution Overview
Problem
In wireless communications systems with PDCCH repetition and overlapping search space sets, there is a lack of a well-defined procedure for the UE and BS to determine which PDCCH candidate to monitor, leading to potential misalignment in communication timelines and reduced likelihood of successful communication.
Innovation Solution
Implement a prioritization and reference selection rule to determine which PDCCH candidate to monitor and define a reference for linked PDCCH candidates, ensuring synchronization between the UE and BS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDCCH repetition with overlapping search space sets is implemented, then system capacity and spectral efficiency are improved, but the UE and BS may become misaligned on which PDCCH candidate to monitor, reducing communication reliability
Solution Approach 1:
The patent applies preliminary action by establishing a pre-defined selection rule before PDCCH monitoring occurs. The rule specifies that when resource overlap is detected between PDCCH candidates in different search space sets, the UE should select the candidate with the lower search space set index for monitoring. This pre-established criterion ensures both UE and BS operate with the same reference candidate, preventing misalignment while maintaining the benefits of PDCCH repetition for enhanced system capacity and spectral efficiency
2Adaptability or versatility
If multiple PDCCH candidates are monitored without a defined selection rule, then coverage of control information is improved, but timeline synchronization between UE and BS deteriorates
Solution Approach 1:
The patent applies preliminary action by establishing a pre-defined selection rule before PDCCH monitoring occurs. The rule specifies that when resource overlap is detected between PDCCH candidates in different search space sets, the UE should select the candidate with the lower search space set index for monitoring. This pre-established criterion ensures both UE and BS operate with the same reference candidate, preventing misalignment while maintaining the benefits of PDCCH repetition for enhanced system capacity and spectral efficiency
3Productivity
If PDCCH candidates from different search space sets share the same resources, then resource utilization efficiency is improved, but ambiguity arises in determining the reference candidate
Solution Approach 1:
The patent applies asymmetry by introducing a breaking tie mechanism based on search space set indices. When multiple PDCCH candidates share the same resources, the rule asymmetrically selects the candidate with the lower index as the reference. This breaks the symmetry and eliminates ambiguity in reference candidate determination, allowing efficient resource sharing while maintaining clear identification of the reference candidate for timing purposes
Data Source
AI summary
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for maintaining, between a user equipment (UE) and a component of a base station (BS), a mutual understanding of multiple sets of linked physical downlink control channel (PDCCH) candidates if some PDCCH candidates of the multiple sets of linked PDCCH candidates occupy a same set of resources. In one aspect, the UE may select to monitor one of the PDCCH candidates that occupy the same set of resources in accordance with a prioritization rule. Upon selecting one of the PDCCH candidates that occupy the same set of resources for monitoring by the UE, the UE and the component of the BS may select a reference PDCCH candidate for one or more of the multiple sets of PDCCH candidates in accordance with a reference selection rule.