NR CORESET Search Space Layout for LBT-Based PDCCH Scheduling
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently managing control resource sets (CORESETs) in unlicensed spectrum, particularly in managing search space sets with varying frequency domain monitoring locations and performing listen-before-talk (LBT) operations across multiple resource block sets, leading to impaired PDCCH performance and increased complexity.
Innovation Solution
Implementing a unified CORESET configuration where all search space sets are of the same type, using the same frequency domain monitoring locations and performing selective PDCCH transmission based on successful LBT operations across multiple resource block sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple types of search space sets are configured with different frequency domain monitoring locations, then the system can provide more flexible monitoring options, but the complexity of CCE counting and channel estimation increases
Solution Approach 1:
The patent applies homogeneity by configuring all search space sets within a CORESET to be of the same type (either all with frequency domain monitoring locations or all without), eliminating the complexity associated with handling multiple types of search space sets while maintaining monitoring flexibility through other means
2Reliability
If LBT operations are performed across multiple resource block sets, then the system can improve spectrum access reliability in unlicensed bands, but the transmission time and operational complexity increase
Solution Approach 1:
The patent segments the CORESET into multiple resource block sets, each independently subjected to LBT operations. This allows the system to perform LBT on smaller units rather than the entire CORESET, reducing the time loss while maintaining reliability through selective transmission on successful segments
Solution Approach 2:
The patent implements partial action by selectively transmitting PDCCH only on resource block sets where LBT succeeds, rather than requiring all resource block sets to be successful. This reduces the overall time loss while maintaining acceptable reliability levels
3Measurement precision
If unified CORESET configuration is implemented with same-type search space sets, then the channel estimation efficiency improves, but the adaptability to different monitoring requirements decreases
Solution Approach 1:
The patent achieves universality by designing a unified CORESET configuration that can serve multiple monitoring requirements through a single consistent structure. The same-type search space sets provide a universal foundation that works across different scenarios, while higher-layer configurations can still provide customization where needed
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive configurations for a plurality of search space sets for a control resource set (CORESET), the plurality of search space sets including one or more of a first type of search space set configured with multiple frequency domain monitoring locations or a second type of search space set configured without multiple frequency domain monitoring locations. The UE may receive a physical downlink control channel communication based at least in part on monitoring the plurality of search space sets according to a determination that the CORESET is associated with search space sets of a same type. Numerous other aspects are described.