Multi-Stage DCI for Frequency-Selective Uplink Precoding
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing the significant indication overhead required for frequency-selective uplink precoding, particularly in 5G/NR systems, which can impact UL performance and capacity.
Innovation Solution
A two-stage DCI framework is introduced, where the first-stage DCI contains partial information for frequency-selective UL precoding, and the second-stage DCI provides the remaining information, reducing the overall signaling burden and enhancing UL precoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency-selective UL precoding is implemented, then UL performance and capacity are improved, but indication overhead increases significantly
Solution Approach 1:
The DCI message is divided into two stages: first-stage DCI containing common information applicable to multiple resource blocks, and second-stage DCI containing frequency-selective precoding information. This segmentation reduces the overhead by avoiding redundant transmission of common parameters across all resource blocks while still enabling frequency-selective precoding where needed.
Solution Approach 2:
Instead of providing complete frequency-selective precoding information for all resource blocks, the system provides partial information in the first-stage DCI that can be applied broadly, and only the necessary additional information in the second-stage DCI for specific frequency selections. This partial action approach reduces overhead while maintaining adequate UL performance.
2Manufacturing precision
If complete UL precoding information is provided in single-stage DCI, then precoding accuracy is maintained, but signaling burden increases
Solution Approach 1:
The precoding information is segmented into essential parameters in first-stage DCI (applicable to multiple resource blocks) and supplementary parameters in second-stage DCI (for specific frequency selections). This maintains precoding accuracy by providing necessary frequency-selective information while reducing signaling burden through efficient organization.
Solution Approach 2:
The system transitions from a single-dimensional DCI structure to a two-dimensional hierarchical structure with first-stage and second-stage DCI. This dimensional change allows precise precoding control to be achieved through coordinated information from both stages rather than requiring all information in a single overloaded message.
Data Source
AI summary
Apparatuses and methods for multi-stage downlink control information (DCI) for uplink (UL) precoding in a wireless communication system. A method for operating a user equipment (UE) receiving, via a two-stage DCI framework, configuration information for transmission of an UL signal. The configuration information includes allocated resources for the UL signal transmission and UL precoding information. The method further includes applying, based on the UL precoding information, UL precoding for the transmission of the UL signal and transmitting the precoded UL signal on the allocated resources. The two-stage DCI framework includes a first-stage DCI, X1, and a second-stage DCI, X2. The first-stage DCI, X1, includes at least one of first information associated with the second-stage DCI and a first part of the configuration information. The second-stage DCI, X2, includes at least one of second information based on the first information and a second part of the configuration information.