New Radio CORESET Search Spaces with Consistent RB Grids
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing control resource sets (CORESET) in unlicensed spectrum (NR-U) due to complexities in channel estimation and partial transmission of physical downlink control channels (PDCCH) caused by varying frequency domain monitoring locations and listen-before-talk (LBT) operations, leading to impaired performance.
Innovation Solution
Configuring search space sets for a CORESET with either multiple or no frequency domain monitoring locations, ensuring all sets are of the same type to use a consistent RB grid, and selectively transmitting PDCCH based on successful LBT operations for multiple resource block sets, thereby improving channel estimation efficiency and reducing partial transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If search space sets are configured with varying frequency domain monitoring locations, then adaptability to different channel conditions is improved, but channel estimation complexity and inconsistency increase
Solution Approach 1:
The patent applies local quality by allowing different search space sets to have different frequency domain monitoring location configurations based on their specific requirements. Each search space set can be independently configured with appropriate monitoring locations suited to its function and channel conditions, while maintaining consistent RB grid structure for channel estimation.
2Reliability
If PDCCH transmission is attempted across multiple resource block sets, then coverage and reliability are improved, but partial transmissions due to LBT failures increase
Solution Approach 1:
The patent applies preliminary action by performing LBT operations on all resource block sets before PDCCH transmission. The base station determines in advance which resource block sets have successful LBT outcomes and uses only those for transmission, avoiding partial transmissions and improving overall transmission efficiency while maintaining reliability.
3Adaptability or versatility
If search space sets use different RB grids, then flexibility in resource allocation is improved, but channel estimation consistency deteriorates
Solution Approach 1:
The patent applies homogeneity by ensuring that all search space sets within a CORESET use the same RB grid structure. This consistency enables uniform channel estimation procedures across all search space sets, improving estimation precision while still allowing flexibility in how resources are allocated and configured within that common grid framework.
Data Source
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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.