Uplink Control Channel Spatial Relation Management
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Solution Overview
Problem
In future radio communication systems, such as NR, configuring an appropriate spatial relation for uplink transmission, particularly for a plurality of candidates set by higher layer signaling, becomes challenging as the number of candidates increases, potentially leading to degradation of communication quality.
Innovation Solution
A terminal and radio communication method where control information sets activation and deactivation of spatial relation information in common for multiple uplink control channel resource indexes, allowing for efficient control of spatial relations applied to uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of spatial relation candidates for uplink transmission is increased, then the adaptability and communication quality are improved, but the device complexity and control information overhead increase
Solution Approach 1:
The patent segments the control of spatial relation information by introducing separate MAC CE mechanisms for activation/deactivation and for indicating spatial relation indices. This division allows independent optimization of each control function, reducing the complexity of managing multiple spatial relation candidates while maintaining adaptability.
Solution Approach 2:
The patent implements preliminary configuration of spatial relation candidates through higher layer signaling before transmission. By pre-configuring multiple spatial relation candidates and their associated reference signals, the system prepares the necessary spatial relations in advance, allowing efficient selection and activation during transmission without increasing real-time control overhead.
2Measurement precision
If separate control information is configured for each uplink control channel resource, then the measurement precision of spatial relation control is improved, but the loss of information and overhead increase
Solution Approach 1:
The patent merges the control of spatial relation information across multiple uplink control channel resources by introducing a common activation/deactivation MAC CE that applies to multiple PUCCH resource indexes simultaneously. This merging reduces control information overhead while maintaining precise spatial relation control through the separate spatial relation indication mechanism.
Solution Approach 2:
The activation/deactivation MAC CE is designed with universal applicability to multiple PUCCH resource indexes, allowing a single control message to manage spatial relation information across multiple resources. This multi-functional approach reduces overhead while maintaining the precision needed for each individual resource through the subsequent spatial relation indication.
Data Source
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AI summary
In order to appropriately control a spatial relation (for example, UL beam) applied to UL transmission, a user terminal according to one aspect of the present disclosure includes: a receiving section that receives control information in which activation and deactivation of spatial relation information of an uplink control channel are set in common for a plurality of uplink control channel resource indexes; and a control section that controls transmission of an uplink control channel on the basis of the control information.