PDCCH Repetition Overlap Rules for Linked Search Space Sets
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ambiguities arise in wireless communications systems due to overlapping search space sets with the same control resource set, leading to uncertainties in decoding physical downlink control channels, particularly in NR systems, which affect the reliability and efficiency of data transmission.
Innovation Solution
Implementing techniques to resolve ambiguities by defining overlap rules for search space set linking, including determining associations, monitoring occasions, and decoding strategies for physical downlink control channel repetition, such as skipping redundant decoding and applying index or symbol-based rules to clarify DCI interpretation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If search space sets are configured for PDCCH repetition with overlapping monitoring occasions, then reliability of data transmission is improved through redundancy, but ambiguities arise in decoding processes and device complexity increases
Solution Approach 1:
The patent segments the decoding process by introducing specific rules to divide overlapping monitoring occasions into distinct groups. Search space sets with overlapping monitoring occasions are segmented and assigned different handling rules based on their configuration parameters, allowing the UE to process each segment separately rather than dealing with the entire overlapping set as one complex problem.
Solution Approach 2:
The patent applies preliminary action by establishing overlap rules and association rules before the actual decoding process. The network configures search space sets with specific parameters (such as different CORESET IDs, different TCI states, or different monitoring occasion patterns) in advance, so that when overlapping occurs, the UE can immediately apply pre-defined rules to resolve ambiguities without complex real-time analysis.
2Reliability
If multiple search space sets with same CORESET are used for PDCCH repetition, then redundancy is achieved for reliable decoding, but ambiguities occur in determining which monitoring occasions to monitor
Solution Approach 1:
The patent applies local quality by making each search space set have distinctive local characteristics even when they share the same CORESET. This is achieved by configuring different parameters for each search space set (such as different monitoring occasion offsets, different periodicities, or different associations with other search space sets), allowing the UE to distinguish and monitor specific occasions based on these local differences.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of association rules that link search space sets to specific monitoring occasions. These association rules act as intermediaries between the multiple search space sets and the UE's monitoring process, providing clear guidance on which occasions to monitor without requiring the UE to independently resolve all ambiguities.
3Device complexity
If PDCCH candidates from different search space sets are treated as one candidate, then blind decoding complexity is reduced, but power consumption increases due to redundant monitoring
Solution Approach 1:
The patent applies dynamics by making the treatment of PDCCH candidates flexible rather than static. The UE dynamically determines whether to treat candidates from different search space sets as one or separate candidates based on the specific configuration and overlap rules. This dynamic approach allows the system to optimize between decoding complexity and power consumption on a per-instance basis rather than using a fixed rule.
Data Source
AI summary
Methods, systems, and devices for communications management are described. In one example, a method for wireless communication at a user equipment (UE) is described. The method may include receiving a configuration of a first search space (SS) set and a second SS set and identifying a link between the first SS set and the second SS set for physical downlink control channel repetition. The method may also include identifying one or more monitoring occasions in the first SS set or the second SS set to monitor for downlink control information based at least in part on an overlap rule associated with the link between the first SS set and the second SS set for physical downlink control channel repetition. The method may include monitoring the identified one or more monitoring occasions in at least the first SS set or the second SS set for the downlink control information.