CORESET Precoding Granularity Indication for NR-Light UEs
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently scheduling multiple user equipment (UEs) with varying capabilities, particularly low-tier UEs like NR-Light UEs, due to limitations in precoder granularity units, which affect channel estimation performance and scheduling flexibility.
Innovation Solution
Introducing a precoder granularity unit for control resource sets (CORESET) that is greater than a resource element group (REG) bundle but less than contiguous resource blocks, allowing for improved channel estimation and scheduling of multiple UEs with reduced capability, such as NR-Light UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a precoder granularity unit equal to contiguous resource blocks is used, then scheduling flexibility is improved, but channel estimation performance deteriorates for low-tier UEs
Solution Approach 1:
The precoder granularity unit is segmented into a new granularity level that is greater than REG bundle but less than contiguous resource blocks. This segmentation allows the system to divide the control resource set into appropriate-sized units that balance scheduling flexibility with channel estimation accuracy for low-tier UEs.
Solution Approach 2:
The precoder granularity parameter is changed from traditional options (REG bundle or contiguous resource blocks) to a new intermediate granularity level. This parameter change optimizes the trade-off between scheduling flexibility and channel estimation performance specifically for low-tier UEs with reduced capabilities.
2Measurement precision
If REG bundle is used as precoder granularity unit, then channel estimation performance is maintained, but scheduling flexibility deteriorates
Solution Approach 1:
Instead of using the fine-grained REG bundle, the system segments the control resource set into a coarser but not overly coarse unit. This intermediate segmentation provides both adequate channel estimation performance and improved scheduling flexibility compared to REG bundle.
Solution Approach 2:
The precoder granularity unit is made dynamic and configurable, allowing the system to adapt the granularity level based on UE capabilities and scheduling requirements. This enables optimization for different scenarios including low-tier UEs while maintaining overall system flexibility.
3Device complexity
If traditional precoder granularity units are used, then system complexity is low, but support for multiple UE types deteriorates
Solution Approach 1:
The system introduces a configurable precoder granularity parameter with multiple possible values (including the new intermediate granularity). This parameter change allows the system to adapt to different UE types without fundamental architectural changes, maintaining low complexity while improving versatility.
Solution Approach 2:
The new precoder granularity unit design provides universal support for multiple UE types including legacy UEs and low-tier UEs. The configurable granularity level allows a single system design to serve diverse UE capabilities without requiring separate specialized mechanisms.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration for a control resource set (CORESET) that indicates a precoder granularity unit over which a same precoding is used for resources of the CORESET. The precoder granularity unit may be greater than a resource element group bundle of the CORESET and less than contiguous resource blocks of the CORESET. The UE may monitor for one or more physical downlink control channel candidates according to the configuration. Numerous other aspects are provided.