QCL Configuration for Multi-TRP Downlink Shared Channels
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Solution Overview
Problem
In the NR wireless communication system, the configuration of quasi co-location (QCL) for multiple transmission reception points (TRPs) or panels is not properly executed due to limitations in control signal formats, making it difficult to individually apply TCI states to each downlink shared channel.
Innovation Solution
A user equipment is provided with a receiving unit to receive information on transmission configuration states and a control unit that applies individual QCL configurations to each downlink shared channel from multiple TRPs or panels, enabling communication via downlink shared channels with appropriate QCL assumptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single control signal format is used for downlink shared channels from multiple TRPs or panels, then device complexity is reduced, but QCL configuration precision deteriorates
Solution Approach 1:
The control signal format is segmented into two distinct parts: a first control signal that provides common QCL configuration applicable to all downlink shared channels, and a second control signal that provides individual QCL configuration for each specific downlink shared channel. This segmentation allows the system to maintain simple common configurations while enabling precise individual QCL settings for multiple TRPs or panels without overwhelming device complexity.
2Reliability
If individual QCL configuration is applied to each downlink shared channel from multiple TRPs or panels, then communication reliability is improved, but control signal complexity increases
Solution Approach 1:
The control signaling is divided into hierarchical layers: a first control signal transmitted at a higher layer providing common QCL configuration that reduces overall signaling overhead, and a second control signal providing specific QCL configuration for each downlink shared channel. This hierarchical segmentation ensures reliable individual QCL configuration for each TRP or panel while managing control signal complexity through structured organization.
Solution Approach 2:
The first control signal provides preliminary QCL configuration information in advance before the actual downlink shared channel transmission. This preliminary action establishes a baseline QCL configuration that applies to multiple channels, reducing the amount of information that needs to be transmitted individually for each channel and thereby managing control signal complexity while ensuring reliability.
3Device complexity
If common QCL configuration is applied to all downlink shared channels, then device complexity is reduced, but communication efficiency deteriorates
Solution Approach 1:
The QCL configuration is segmented into common and specific components. The first control signal provides common QCL configuration that applies to all downlink shared channels, simplifying configuration management. The second control signal provides specific QCL configuration for each individual downlink shared channel, ensuring that each channel is optimized for its specific TRP or panel characteristics, thereby maintaining high communication efficiency without excessive complexity.
Solution Approach 2:
The first control signal serves a universal function by providing QCL configuration that applies to multiple downlink shared channels simultaneously. This multi-functionality reduces configuration management complexity by handling common settings in a single signal, while the second control signal handles channel-specific optimizations, achieving a balance between simplicity and efficiency.
Data Source
AI summary
A user equipment includes a receiving unit that receives information related to a transmission configuration state of a downlink shared channel from a base station device, a control unit that individually applies a configuration related to quasi co-location (QCL) to each of the downlink shared channels transmitted from a plurality of transmission reception points (TRPs) or panels, based on the information related to the transmission configuration state, and a communication unit that performs communication via the downlink shared channel to which the configuration related to the plurality of QCLs is individually applied.