Uplink CSI Multiplexing Across TRPs in Repeated Shared Channels
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Solution Overview
Problem
Existing communication systems, such as those of the NR, 5G, 5G, 5G+, and 5G+ technologies, struggle to effectively address the challenges of reporting Channel State Information (CSI) during repetitive transmissions to multiple Transmission and Reception Points (TRPs) in future communication systems, specifically in the context of 5G, 5G, and 5G, 5G, 5G, and 5G, 5G, 5G, and 5G, and 5G, 5G+ technologies, where CSI reporting to multiple TRPs is not adequately addressed.
Innovation Solution
A user terminal and radio communication method that includes a transmitting section for transmitting multiple uplink shared channels to multiple TRPs and a control section for multiplexing channel state information associated with these TRPs, utilizing quasi-co-location (QCL) information and Transmission Configuration Indicator (TCI) states to facilitate appropriate CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repetitive transmissions of uplink shared channel are performed to multiple TRPs, then communication reliability is improved, but CSI reporting becomes complex and insufficiently studied
Solution Approach 1:
The patent combines multiple CSI reports associated with different TRPs into a single uplink shared channel transmission. The control section multiplexes channel state information from multiple TRPs, allowing the terminal to report CSI for all TRPs simultaneously rather than requiring separate reporting mechanisms for each TRP, thus reducing system complexity while maintaining multi-TRP operation
Solution Approach 2:
The uplink shared channel is designed to serve multiple functions: it carries both user data and multiplexed CSI reports for multiple TRPs. This universal channel structure eliminates the need for separate dedicated reporting channels for each TRP, simplifying the overall system architecture while supporting reliable multi-TRP communications
2Reliability
If CSI is not appropriately reported during multi-TRP transmissions, then communication quality degrades
Solution Approach 1:
Multiple CSI reports that would otherwise be transmitted separately are merged into a single multiplexed transmission. The control section combines channel state information from multiple TRPs into one unified report structure, ensuring that no CSI information is lost while reducing the number of separate transmission events required
Solution Approach 2:
The patent implements a feedback mechanism where the terminal measures channel state information from multiple TRPs and feeds back this information to the base station through the uplink shared channel. This feedback loop ensures that the base station receives current channel conditions for all TRPs, enabling it to adjust transmission parameters and maintain communication quality
Data Source
AI summary
A terminal is disclosed including a receiver that receives information including multiple spatial relation information; and a processor that controls transmission of channel state information using first spatial relation information that corresponds to a first transmission and reception point among the multiple spatial relation information, on a first repetition of multiple repetitions of an uplink shared channel, and controls transmission of the channel state information using second spatial relation information that corresponds to a second transmission and reception point among the multiple spatial relation information, on a second repetition of the multiple repetitions of the uplink shared channel. In other aspects, a communication method, a base station, and a system are also disclosed.