CORESET Interleaving and Cyclic Shifting for NR-Light PDCCH Decoding
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently supporting UEs with reduced capabilities, such as NR-Light UEs, in decoding physical downlink control channels (PDCCH) due to limitations in configuring interleaving and cyclic shifting for control resource sets (CORESET) that span more than three symbols.
Innovation Solution
Implementing techniques for interleaving and cyclic shifting configurations for CORESET repetitions, allowing REG bundles to be mapped to symbol groups beyond three symbols, thereby enhancing the decoding capabilities of UEs with reduced capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interleaving and cyclic shifting configurations are applied to CORESET spanning more than three symbols, then the decoding capability for UEs with reduced capabilities is improved, but the device complexity increases
Solution Approach 1:
The CORESET is divided into multiple Control Resource Blocks (CRBs) that are independently interleaved and cyclically shifted. Each CRB can be configured separately, allowing the system to apply complexity only where needed while keeping other portions simple, thus resolving the contradiction between improved decoding capability and reduced device complexity
Solution Approach 2:
The interleaving and cyclic shifting configurations are made dynamic and configurable based on UE capability. The system can adaptively adjust the configuration complexity match the specific UE's decoding capabilities, providing enhanced reliability for capable UEs while maintaining lower complexity for UEs with reduced capabilities
2Productivity
If REG bundles are mapped to symbol groups beyond three symbols, then resource utilization efficiency is improved, but the configuration complexity for UEs with reduced capabilities worsens
Solution Approach 1:
Different symbol group mapping configurations are applied to different regions of the CORESET based on local requirements. REG bundles in certain symbol groups can be mapped with higher efficiency while other regions maintain simpler configurations, allowing the system to achieve improved resource utilization without uniformly increasing configuration complexity across all UEs
Solution Approach 2:
The system changes the mapping parameters dynamically based on UE capability indicators. For UEs with reduced capabilities, the parameter changes are optimized to provide sufficient resource utilization while keeping the configuration complexity within manageable limits, thus resolving the contradiction between productivity and device complexity
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine at least one of an interleaving configuration or a cyclic shift configuration for respective repetitions of a control resource set (CORESET). The UE may monitor for one or more physical downlink control channel candidates in the respective repetitions of the CORESET based at least in part on determining the at least one of the interleaving configuration or the cyclic shift configuration for the respective repetitions. Numerous other aspects are provided.