Uplink Control Omission for Coherent Multi-TRP Joint Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing uplink control information (UCI) for multi-transmission-reception-point (multi-TRP) coherent joint transmission (CJT) operations, which can strain battery life in user equipment (UE) devices while compromising signal accuracy and network efficiency.
Innovation Solution
A method for calculating and prioritizing precoding matrix indicator (PMI) entries based on TRP indices, layer indices, and spatial/frequency basis indices, with entries below a threshold being omitted to optimize UCI transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full PMI entries are transmitted for multi-TRP CJT operation, then signal accuracy is improved, but power consumption increases
Solution Approach 1:
The patent extracts and transmits only the most critical PMI entries (non-zero elements) while omitting less important entries (zero elements). This selective extraction maintains signal accuracy for multi-TRP CJT operation while significantly reducing the amount of UCI transmitted, thereby lowering power consumption in UE devices.
Solution Approach 2:
The patent applies local quality by differentiating the importance of different PMI entries based on their spatial and frequency characteristics. Entries corresponding to significant signal components are transmitted with high precision, while entries corresponding to negligible components are omitted, optimizing the balance between accuracy and power consumption.
2Productivity
If comprehensive UCI is transmitted for multi-TRP CJT, then network efficiency is improved, but battery life is reduced
Solution Approach 1:
The patent extracts only the essential PMI information needed for multi-TRP CJT operation, removing redundant zero entries from the UCI payload. This reduces the uplink control information size, extending battery life in UE devices while maintaining network efficiency through compact yet sufficient channel state feedback.
Solution Approach 2:
The patent changes the parameter of UCI payload size by selectively transmitting only non-zero PMI entries. This parameter optimization reduces the amount of data transmitted over the air interface, thereby extending battery life while maintaining the necessary network efficiency for multi-TRP CJT operation.
3Manufacturing precision
If all PMI entries are reported, then transmission accuracy is improved, but UCI overhead increases
Solution Approach 1:
The patent extracts and transmits only the non-zero PMI entries, omitting zero entries from the UCI report. This extraction approach reduces UCI overhead by eliminating redundant information while maintaining transmission accuracy through the selective inclusion of only significant channel state components.
Solution Approach 2:
The patent segments the PMI matrix into significant (non-zero) and insignificant (zero) elements, processing and transmitting only the significant segments. This segmentation reduces the overall UCI overhead while preserving transmission accuracy by focusing resources on the most important channel characteristics.
Data Source
AI summary
Devices and methods for performing uplink control information (UCI) omission for multi-transmission-reception-point coherent joint transmission in a wireless communication system. A user equipment (UE) calculates a priority for each of a plurality of non-zero entries of a precoding matrix indicator (PMI). The priorities are calculated based at least in part on respective transmission reception point (TRP) indices layer indices, spatial basis indices, and/or frequency basis indices associated with the respective non-zero entries of the PMI. The wireless device provides UCI including the PMI to the base station, where entries of the PMI with priorities less than a predetermined threshold are omitted.