PDCCH Transmission via Multi-CORESET QCL Configuration
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving physical downlink control channels (PDCCH) due to increased data traffic, higher transmission rates, and the need for low latency and high energy efficiency.
Innovation Solution
The method involves configuring multiple transmission and reception points (TRPs) to transmit and receive PDCCH for the same downlink control information, using different quasi co-location (QCL) configurations for spatial reception parameters, and determining the CORESETs based on priority rules and search space links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple CORESETs with different QCL configurations are used for PDCCH transmission, then reliability of downlink control information is improved, but device complexity increases
Solution Approach 1:
The patent divides the PDCCH transmission into multiple CORESETs (Control Resource Sets) with different QCL (Quasi-Co-Location) configurations. Each CORESET represents a segmented transmission path with distinct spatial parameters, allowing the system to transmit redundant control information through multiple independent channels. This segmentation enables the terminal to receive and combine signals from different spatial locations, thereby improving reliability without requiring the entire system to be redesigned for high reliability.
Solution Approach 2:
The patent introduces spatial diversity by utilizing different QCL configurations across multiple CORESETs. Instead of improving reliability through repeated transmissions in the same spatial dimension, the system transitions to another dimension (spatial configuration) by assigning different QCL parameters (such as different reference signals or spatial filters) to each CORESET. This dimensional approach allows the terminal to process multiple PDCCH candidates with different spatial characteristics, enhancing reliability while managing complexity through structured spatial differentiation.
2Reliability
If multiple TRPs are configured for PDCCH transmission, then robustness of communication is enhanced, but processing time requirements increase
Solution Approach 1:
The patent configures multiple Transmission Reception Points (TRPs) with distinct QCL configurations in advance, establishing predetermined processing paths for each TRP. The terminal is pre-configured with multiple Search Space Sets associated with different CORESETs, each linked to a specific TRP. This preliminary configuration allows the terminal to efficiently process multiple PDCCH candidates from different TRPs without requiring complex real-time decision-making, thereby enhancing robustness while controlling processing time through pre-established processing rules.
Solution Approach 2:
The patent varies the QCL parameters across multiple TRPs to create distinguishable transmission characteristics. Each TRP is associated with different QCL configurations (such as different reference signal resources or spatial parameters), which allows the terminal to differentiate and process signals from multiple TRPs efficiently. This parameter differentiation enables the system to achieve robust communication through multi-TRP transmission while managing processing time by providing clear, distinguishable parameters for each transmission path.
3Adaptability or versatility
If search space sets are linked across multiple CORESETs, then adaptability of PDCCH reception is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent introduces Search Space Sets as intermediary structures that link multiple CORESETs with different QCL configurations. Each Search Space Set acts as a mediator that associates a terminal's monitoring requirements with specific CORESETs and their corresponding TRPs. This intermediary layer simplifies the detection process by providing a structured mapping between terminal monitoring needs and multiple CORESET resources, thereby improving adaptability while reducing the difficulty of detecting and measuring PDCCH candidates across multiple TRPs through organized association rules.
Data Source
AI summary
A method and an apparatus of transmitting and receiving a physical downlink control channel (PDCCH) in a wireless communication system is disclosed. A method of receiving a physical downlink control channel (PDCCH) according to an embodiment of the present disclosure may include receiving, from a base station, configuration information related to one or more search space sets for the PDCCH; and based on overlapping of one or more monitoring occasions in a plurality of control resource sets (CORESETs) with different QCL (quasi co-location) configurations for a spatial reception parameter, receiving, from the base station, the PDCCH in a first CORESET with a first QCL configuration for the spatial reception parameter and a second CORESET with a second QCL configuration for the spatial reception parameter among the plurality of CORESET. The first CORESET may be determined based on a predetermined priority rule, and the second CORESET may be determined as a CORESET associated with a second search space set linked to a first search space set associated with the first CORESET for transmission of the PDCCH, and the configuration information may include information on the link between the first search space set and the second search space set.