Deterministic PDCCH Reference Selection Across Overlapping Search Space Sets
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Solution Overview
Problem
In wireless communications systems featuring PDCCH repetition with 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 and define as the reference, leading to potential misalignment in communication timelines and reduced likelihood of successful communication.
Innovation Solution
Implement a prioritization and reference selection rule to ensure the UE and BS mutually agree on which PDCCH candidate to monitor and select as the reference, thereby maintaining synchronization and defining communication timelines based on resource overlap and priority rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH repetition with overlapping search space sets is deployed to increase reliability, then communication reliability is improved, but resource overlap causes ambiguity in reference candidate selection leading to misalignment
Solution Approach 1:
The patent changes the parameter of reference candidate selection by introducing a prioritization rule based on search space set indices. When resource overlap occurs between first and second search space sets, the UE and base station compare the indices and deterministically select the reference candidate from the set with the lower index, eliminating ambiguity while maintaining the reliability benefits of PDCCH repetition
Solution Approach 2:
The patent applies preliminary action by pre-defining the reference candidate selection rule before PDCCH repetition transmission occurs. The prioritization rule based on search space set indices is established in advance, allowing both UE and base station to independently determine the same reference candidate without requiring additional signaling or coordination during the actual transmission
2Reliability
If multiple PDCCH candidates are monitored to ensure reliable reception, then communication reliability is improved, but processing complexity and latency increase
Solution Approach 1:
The patent extracts the reference candidate selection logic from the set of monitored PDCCH candidates by applying the prioritization rule. Instead of processing all overlapping candidates equally, the rule extracts and designates one specific candidate as the reference, allowing the UE to focus decoding efforts on this single reference candidate while still monitoring other candidates for potential reception
Solution Approach 2:
The reference candidate is preliminarily identified before actual PDCCH decoding occurs. By pre-determining which candidate serves as the reference based on search space set index comparison, the UE can prepare the reference candidate for decoding in advance, reducing processing latency while maintaining reliability through monitoring of multiple candidates
3Adaptability or versatility
If reference PDCCH candidate selection is left undefined to allow flexibility, then adaptability is improved, but misalignment between UE and BS occurs reducing communication success
Solution Approach 1:
The patent changes the selection parameter from flexible/undefined to deterministic by introducing the search space set index as the deciding factor. This parameter change maintains adaptability across different deployment scenarios while ensuring that both UE and base station arrive at the same reference candidate selection through objective index comparison rather than subjective or ambiguous criteria
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.