DCI Reception via Overlapping CORESETs in Wireless Systems
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Solution Overview
Problem
In wireless communication systems, existing methods for transmitting and receiving downlink control information (DCI) between a terminal and a base station face challenges in ensuring high success probability and low latency, particularly in ultra-reliable low-latency communication (URLLC) modes, where multiple control resource sets (CORESETs) overlap, leading to interference and degraded channel estimation performance.
Innovation Solution
The method involves configuring multiple CORESETs with overlapping or non-overlapping time and frequency domains, using the same or different demodulation reference signal (DMRS) scrambling IDs, and ensuring common or independent parameters for each CORESET, allowing the user equipment (UE) to receive the same DCI from multiple PDCCH candidates, thereby improving decoding performance and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple CORESETs are configured with overlapping time and frequency domains to improve DCI detection reliability, then the success probability of DCI reception is improved, but interference between CORESETs increases and channel estimation performance deteriorates
Solution Approach 1:
The patent applies local quality by assigning different DMRS scrambling IDs to different CORESETs. Specifically, when CORESETs overlap in time and frequency domains, each CORESET is configured with a distinct DMRS scrambling identifier, which localizes the reference signal characteristics to each specific CORESET region. This allows the UE to differentiate and estimate channels for each CORESET separately, reducing inter-CORESET interference and improving channel estimation accuracy in overlapping regions while maintaining high DCI detection reliability.
2Reliability
If multiple PDCCH candidates are monitored in overlapping CORESETs to ensure DCI reception, then the reliability of control information delivery is improved, but the complexity of blind decoding increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the DMRS scrambling ID parameter based on CORESET configuration. When multiple PDCCH candidates are monitored across overlapping CORESETs, each candidate's associated CORESET uses a specific DMRS scrambling ID parameter. This parameter differentiation enables the UE to efficiently manage and distinguish between multiple PDCCH candidates during blind decoding, reducing the effective search space complexity while ensuring reliable DCI reception through multiple candidates.
Data Source
AI summary
The present disclosure provides a method for transmitting and receiving downlink control information (DCI) between a terminal and a base station in a wireless communication system and a device for supporting same. According to an embodiment applicable in the present disclosure, a terminal can recognize/expect that multiple control resource sets (CORESETs) include identical DCI, on the basis of configuration information received from a base station, and on the basis thereof, can receive the DCI via at least one of the multiple CORESETs.