Uplink Control Signaling for MU-MIMO Channel Quantization
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Solution Overview
Problem
The existing UCI design for MU-MIMO in 3GPP NR Rel-15 and 16 has inefficiencies in signaling overhead and SCI reporting, particularly when optimizing the number of nonzero LC coefficients across layers, which can negatively impact performance.
Innovation Solution
A novel UCI design that involves determining a matrix with spatial and frequency components, shifting the frequency components to place the strongest coefficient at a predetermined index, and transmitting an indication of the spatial component associated with this coefficient, reducing the need for explicit reporting of phase adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional UCI design is used for MU-MIMO, then the structure is simple and easy to implement, but signaling overhead increases and SCI reporting becomes inefficient
Solution Approach 1:
The patent extracts and removes redundant phase adjustment information from the UCI message by exploiting the transparency property of phase rotations in frequency domain compression. Instead of reporting all phase adjustments explicitly, the system only reports spatial component indications, taking out the unnecessary overhead while maintaining compression performance.
Solution Approach 2:
The patent changes the reporting parameter from explicit phase adjustment values to spatial component indications. By reporting which spatial components are associated with nonzero LC coefficients rather than the phase values themselves, the signaling overhead is reduced while the essential information for reconstruction is preserved.
2Reliability
If explicit reporting of phase adjustments is performed, then precoder performance is maintained, but signaling overhead in UCI parts 1 and 2 increases
Solution Approach 1:
The patent converts the transparency property of phase rotations, which was previously seen as a limitation requiring explicit reporting, into a benefit by exploiting it to reduce overhead. The phase transparency is transformed from a constraint into a feature that enables more efficient signaling while maintaining precoder performance through spatial component indication.
3Productivity
If the number of nonzero LC coefficients is optimized, then compression efficiency improves, but SCI reporting becomes less efficient and performance is negatively impacted
Solution Approach 1:
The patent performs preliminary organization of nonzero LC coefficients by spatial component before reporting. By pre-grouping and indicating the spatial components associated with nonzero coefficients, the system enables more efficient SCI reporting that works synergistically with compression optimization, avoiding the performance degradation that would otherwise occur.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices, apparatuses and computer readable storage media for Uplink Control Information (UCI) design. The method comprises determining, at a terminal device, a matrix comprising a set of non-zero linear combination coefficients for quantizing a channel between the terminal device and a network device, the matrix having spatial components and frequency components; shifting the frequency components of the matrix circularly, such that a target coefficient of the set of non-zero linear combination coefficients is located in a frequency component with a predetermined index of the frequency components in a shifted matrix; generating a first indication indicating the spatial component associated with the target coefficient in the matrix; and transmitting, to the network device, uplink control information comprising the first indication. In this way, a new solution for designing the UCI may reduce the overhead for reporting the parameters in the UCI.