Terminal Device Reporting Mode for Multi-TRP Rank Indicator Constraints
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Solution Overview
Problem
In the New Radio (NR) system, there is a challenge in implementing effective measurement and feedback for reference signals to support the transmission of multiple downlink channels, particularly in coordinating multiple transmission nodes to manage the number of transmission layers efficiently.
Innovation Solution
A wireless communication method where a terminal device determines a reporting mode for measurement results of reference signals, either limiting individual Rank Indicator (RI) values or the sum of RIs, to control the number of transmission layers, and communicates this information to the network side, allowing transmission nodes to adjust their transmission accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmission nodes jointly send downlink channels to a terminal device, then the system capacity and coverage are improved, but the complexity of managing transmission layers increases and may exceed terminal device capabilities
Solution Approach 1:
The patent segments the transmission layer management by introducing separate RI reporting mechanisms for different reference signals (first and second RIs for different TRPs). This allows each transmission node to independently manage its transmission layers while the terminal device can process feedback for multiple nodes separately, reducing the overall management complexity.
Solution Approach 2:
The patent changes the reporting parameters by introducing a new RI reporting mode that limits the sum of RIs across multiple reference signals to not exceed the terminal device's capability. This parameter constraint ensures that the total transmission layers remain within manageable limits while still allowing multiple transmission nodes to operate effectively.
2Measurement precision
If the terminal device reports measurement results for multiple reference signals without restrictions, then the feedback accuracy is improved, but the number of transmission layers may exceed the terminal device's demodulation capability
Solution Approach 1:
The patent modifies the RI reporting parameters by introducing a sum constraint that limits the total number of transmission layers to match the terminal device's demodulation capability. This ensures that while accurate feedback is obtained for each reference signal, the overall transmission remains within the device's processing limits, maintaining reliability.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal device reports RIs for multiple reference signals with the constraint that their sum does not exceed the device capability. The network side uses this feedback to adjust transmission parameters, creating a closed-loop system that maintains both accuracy and reliability.
3Productivity
If the network side increases the number of transmission layers to improve data throughput, then the productivity is improved, but the terminal device may fail to successfully demodulate the downlink channels
Solution Approach 1:
The patent changes the transmission layer parameter management by introducing RI sum constraints based on terminal device capabilities. This ensures that the network side can increase throughput by utilizing multiple transmission nodes while the total number of layers remains within the device's demodulation capability, preventing failures.
Solution Approach 2:
The patent introduces dynamic adjustment of transmission layers through RI reporting and feedback mechanisms. The network side can dynamically allocate transmission layers across multiple nodes based on channel conditions and terminal device capabilities, optimizing throughput while maintaining reliability.
Data Source
AI summary
Provided in embodiments of the present application are a wireless communication method, a terminal device, and a transmitting node, which can implement measurement and feedback of reference signals supporting multiple downlink channel transmissions. The method comprises: the terminal device determines a mode for reporting a measurement result of a plurality of reference signals; and the terminal device reports report information including a rank indication corresponding to each of the plurality of reference signals according to the determined mode and the measurement result. The reporting mode determined by the terminal device is a first mode or a second mode. In the first mode, the maximum value of the rank indication in the report information corresponding to each reference signal does not exceed a first predetermined value, and in the second mode, the maximum value of the sum of rank indication values in the report information corresponding to the plurality of reference signals does not exceed a second predetermined value.