Multi-Cell TCI State Control for QCL Beam Alignment
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Solution Overview
Problem
Existing radio communication systems lack sufficient methods for configuring and indicating a common beam for multiple component carriers and bandwidth parts, leading to potential degradation in communication quality and throughput.
Innovation Solution
A terminal and base station that receive configuration information for multiple transmission configuration indication states and determine appropriate quasi-co-location types for demodulation reference signals across serving cells or bandwidth parts, based on specified restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a common TCI is used for multiple CCs/BWPs, then beam management efficiency is improved, but communication quality may degrade due to insufficient configuration methods
Solution Approach 1:
The patent segments the QCL type D reference signal configuration by separating first QCL type D reference signals (for downlink channels) and second QCL type D reference signals (for uplink channels). This segmentation allows independent optimization of downlink and uplink beam management while maintaining common TCI framework, resolving the contradiction between beam management efficiency and communication quality.
Solution Approach 2:
The patent applies local quality by configuring different reference signals for different purposes: first QCL type D reference signals are specifically configured for downlink channel QCL, while second QCL type D reference signals are configured for uplink channel QCL. This localized configuration ensures optimal beam management for each channel type while maintaining overall system efficiency.
2Reliability
If QCL type D reference signals are configured for both downlink and uplink, then beam alignment is improved, but configuration complexity increases
Solution Approach 1:
The patent segments the QCL type D reference signal configuration into two distinct sets: first QCL type D reference signals for downlink channels and second QCL type D reference signals for uplink channels. This segmentation simplifies the configuration process by clearly separating the purposes of different reference signals while maintaining accurate beam alignment for both directions.
Solution Approach 2:
The patent applies local quality by configuring different reference signals for different purposes: first QCL type D reference signals are specifically configured for downlink channel QCL, while second QCL type D reference signals are configured for uplink channel QCL. This localized configuration ensures optimal beam alignment for each channel type while maintaining overall system efficiency.
3Device complexity
If common beam indication is applied to all channels, then signaling overhead is reduced, but beam optimization for specific channels is compromised
Solution Approach 1:
The patent segments the beam indication mechanism by maintaining separate first and second QCL type D reference signal configurations. This allows the common TCI framework to reduce signaling overhead for downlink channels while preserving the ability to optimize uplink beam configuration independently through separate reference signal settings.
Solution Approach 2:
The patent applies local quality by configuring different reference signals for different purposes: first QCL type D reference signals are specifically configured for downlink channel QCL, while second QCL type D reference signals are configured for uplink channel QCL. This localized configuration ensures optimal beam management for each channel type while maintaining overall system efficiency.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a receiving section that receives a list of a plurality of serving cells or a plurality of bandwidth parts and receives configuration information of a plurality of transmission configuration indication (TCI) states applicable to a plurality of types of channels; and a control section that determines a reference signal of a first quasi-co-location (QCL) type and a reference signal of a second QCL type to be applied to the plurality of serving cells or the plurality of bandwidth parts, based on a restriction related to the reference signal of the first QCL type and the reference signal of the second QCL type for a demodulation reference signal (DMRS) and the configuration information. According to one aspect of the present disclosure, it is possible to appropriately perform TCI state indication.