Multi-CORESET PDCCH Aggregation for 5G Coverage
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in enhancing the coverage and performance of the Physical Downlink Control Channel (PDCCH) due to limitations in resource allocation and monitoring efficiency.
Innovation Solution
The method involves configuring a search space with multiple Control Resource Sets (CORESETs) and aggregating PDCCH candidates across these sets, allowing for components associated with different CORESETs on different monitoring occasions, with aggregation levels exceeding a threshold value configured through DCI or MAC-CE signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-CORESET PDCCH transmission is used, then device complexity is low, but PDCCH coverage and reliability are insufficient
Solution Approach 1:
The patent combines multiple CORESETs into a unified search space configuration, allowing the UE to monitor PDCCH candidates across different CORESETs simultaneously. This merging approach improves PDCCH coverage and reliability by providing multiple transmission opportunities without requiring separate monitoring procedures for each CORESET, thus resolving the contradiction between coverage improvement and complexity increase.
2Reliability
If PDCCH aggregation across multiple CORESETs is implemented, then PDCCH coverage is improved, but monitoring complexity increases
Solution Approach 1:
The patent segments the PDCCH monitoring process into distinct components: identifying PDCCH candidates in each CORESET, determining aggregation levels, and combining results across CORESETs. This segmentation allows the UE to handle multiple CORESETs systematically through defined procedures, reducing the practical complexity of monitoring while maintaining improved coverage and performance.
3Reliability
If higher aggregation levels are used, then PDCCH coverage is enhanced, but resource allocation efficiency decreases
Solution Approach 1:
The patent implements dynamic aggregation level selection based on coverage requirements and channel conditions. The UE can adaptively determine the aggregation level for PDCCH candidates in each CORESET, using higher aggregation levels only when coverage enhancement is needed. This dynamic approach allows the system to optimize between coverage and resource efficiency, avoiding unnecessary resource consumption while maintaining improved reliability when required.
Data Source
AI summary
A method of wireless communication may include a UE and a base station. The base station may configure, for the UE, a search space associated with a first CORESET and a second CORESET, and transmit a PDCCH within the configured search space. The UE may monitor for the PDCCH based on the configuration of the search space, where at least one PDCCH candidate may include components associated with different CORESETs on different monitoring occasions. The PDCCH candidate may include a first subset within the first CORESET and a second subset within the second CORESET. The PDCCH candidate may include a third subset including a first and second components, and at least one of the first and second components may be itself a PDCCH candidate within the first or second subset of the PDCCH candidates.