Group Common DCI for CLI Measurement in 5G Full-Duplex
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in effectively managing and reporting cross-link interference (CLI) due to the complexity of coordinating downlink control information (DCI) across multiple user equipment (UEs), which affects the quality of full-duplex communication and interferes with both self-interference and inter-cell interference.
Innovation Solution
The solution involves a method where a common DCI is used to trigger sounding reference signal (SRS) transmissions or CLI measurements across a group of UEs, allowing for coordinated CLI reporting and mitigation, utilizing CSI-IM resources for accurate interference measurement and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate DCIs are used for each UE to trigger SRS transmission or CLI measurement, then each UE can be individually controlled, but the control complexity and signaling overhead increase significantly
Solution Approach 1:
The patent merges multiple separate DCIs into a single common DCI that can be received by multiple UEs simultaneously. This common DCI includes a first indication information for first UEs and a second indication information for second UEs, allowing individual UE control to be maintained while reducing the number of separate control signals needed. This resolves the contradiction by combining control functions without sacrificing individual control capability.
Solution Approach 2:
The common DCI is designed with multi-functionality to serve multiple UE groups simultaneously. It contains indication information that can be interpreted by different UE subsets based on their configuration, enabling a single control message to perform multiple control functions that would otherwise require separate DCIs for each UE group.
2Device complexity
If a common DCI is used for multiple UEs, then signaling overhead and control complexity are reduced, but the precision of individual UE control may be compromised
Solution Approach 1:
The common DCI is segmented into distinct indication information fields - a first indication information for first UEs and a second indication information for second UEs. This segmentation allows the common DCI to maintain precise control over different UE subsets by providing separate control parameters for each group, thus preventing loss of individual control precision while benefiting from reduced overall complexity.
3Adaptability or versatility
If CLI measurement is performed without coordinated triggering, then UE operations are more flexible, but measurement accuracy and consistency across multiple UEs deteriorate
Solution Approach 1:
The common DCI provides coordinated triggering information that enables synchronized CLI measurement across multiple UEs. By including indication information that specifies when and how measurements should be performed, the system achieves measurement precision and consistency while UEs still maintain operational flexibility in their overall communication behavior. The coordinated trigger ensures all UEs measure CLI at appropriate moments for accurate results.
Data Source
AI summary
This disclosure provides systems, devices, apparatus and methods, including computer programs encoded on storage media, for grouping common DCI for CLI measurement and reporting. In a first aspect, a UE may receive DCI that is common to a group of UEs that includes the UE. The DCI may be configured to trigger at least one of an SRS transmission or a CLI measurement. The UE may transmit the SRS transmission and/or report the CLI measurement based on the DCI that is common to the group of UEs. In a second aspect, a base station may transmit at least one DCI that is common to the group of UEs to trigger the at least one of the SRS transmission or the CLI report for the group of UEs. The base station may receive the CLI report from at least a subset of UEs in the group of UEs.