PDCCH Transmission via Multiple TRPs and QCL Prioritization
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Solution Overview
Problem
Current wireless communication systems face challenges in reliably transmitting and receiving physical downlink control channels (PDCCH) due to increased data traffic and the need for faster services, particularly in accommodating a large number of connected devices with low latency and high energy efficiency.
Innovation Solution
The method involves receiving and transmitting PDCCH based on multiple transmission reception points (TRPs), with configuration information for control resource sets (CORESETs) that include quasi co-location (QCL) reference signals, allowing PDCCH candidates to be monitored across multiple TRPs, even in cases of collisions with other signals or resource sets, by prioritizing specific QCL reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH is transmitted using a single TRP, then the system complexity is low, but the reliability and robustness of downlink control information transmission deteriorates
Solution Approach 1:
The patent segments the PDCCH transmission function across multiple TRPs, where each TRP independently transmits PDCCH candidates. This segmentation allows the system to achieve diversity gain and improved reliability by distributing the transmission across multiple spatial locations, while the terminal segments the monitoring process to handle each TRP's PDCCH candidates separately based on QCL relationships.
Solution Approach 2:
The patent introduces a spatial dimension to PDCCH transmission by utilizing multiple TRPs located at different spatial positions. The terminal monitors PDCCH candidates from multiple TRPs by establishing QCL relationships between DMRS ports of different TRPs, effectively adding a spatial dimension to the control channel transmission to improve reliability through spatial diversity.
2Reliability
If multiple QCL reference RSs are configured for PDCCH monitoring, then the robustness against collisions improves, but the terminal processing complexity increases
Solution Approach 1:
The patent applies local quality by configuring different numbers of QCL reference RSs for different CORESETs based on their specific requirements. Some CORESETs are configured with multiple QCL reference RSs for enhanced robustness, while others use fewer references, allowing the system to optimize reliability where needed without uniformly increasing complexity across all PDCCH monitoring instances.
Solution Approach 2:
The patent implements partial action by having the terminal monitor PDCCH candidates in a first CORESET with multiple QCL reference RSs and a second CORESET with one or more QCL reference RSs. The terminal applies different monitoring strategies based on the specific CORESET configuration and collision conditions, rather than uniformly applying the most robust method to all cases, thereby balancing reliability and processing complexity.
3Adaptability or versatility
If PDCCH candidates are monitored in multiple CORESETs with different QCL reference RSs, then the adaptability to collision scenarios improves, but the resource overhead increases
Solution Approach 1:
The patent implements dynamic adaptability by enabling the terminal to flexibly monitor PDCCH candidates across multiple CORESETs with different QCL reference RS configurations based on actual collision conditions. The system dynamically adjusts the monitoring behavior and QCL reference RS selection according to the specific scenario, allowing high adaptability to various collision conditions while optimizing resource usage through conditional monitoring rather than constant maximum monitoring.
Data Source
AI summary
Disclosed are a method and device for transmitting and receiving a physical downlink control channel (PDCCH) in a wireless communication system. A method for receiving a PDCCH according to an embodiment of the present disclosure may comprise the steps of: receiving configuration information related to one or more control resource sets (CORESETs) from a base station; and receiving the PDCCH within the one or more CORESETs from the base station. The configuration information includes information for configuring quasi co-location (QCL) reference signals (RS) for the one or more CORESETs.