Differential Cross-Link Interference Reporting for Full Duplex UEs
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in reporting cross-link interference (CLI) in full duplex mode, particularly in 3GPP Release 16, where cross-link interference varies across subbands and time domains, leading to increased report overhead and interference management challenges.
Innovation Solution
Implementing a method for user equipment (UE) to report differential cross-link interference metric values based on configurations received from a network device, allowing for reduced report overhead by measuring and transmitting these values across multiple subbands and time resources, enabling effective interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If absolute cross-link interference metric values are reported for each subband and time resource, then measurement precision is improved, but report overhead increases
Solution Approach 1:
The report is segmented into two parts: (1) a first set of CLI metric values for a first set of resources (e.g., anchor resource), and (2) a second set of differential CLI metric values for a second set of resources (e.g., non-anchor resources). This segmentation allows precise reporting where needed while reducing overhead through differential encoding for other resources.
Solution Approach 2:
The patent changes the parameter representation by using differential values instead of absolute values for certain CLI metric reports. The differential values represent the difference between CLI metrics of different resources, reducing the number of bits required for reporting while maintaining measurement precision.
2Quantity of substance
If differential cross-link interference metric values are reported for all resources, then report overhead is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent segments resources into anchor resources and non-anchor resources. Anchor resources report absolute CLI metric values to maintain precision, while non-anchor resources report differential values to reduce overhead. This segmentation resolves the contradiction by applying different reporting strategies to different resource types.
Solution Approach 2:
The patent introduces an intermediary reference mechanism where anchor resources serve as reference points for differential reporting. The network device can configure which resources are anchor resources, and the UE uses these anchors as intermediaries to compute and report differential values for other resources, maintaining precision while reducing overhead.
3Measurement precision
If multiple CLI resources are configured for measurement, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the set of configured CLI resources into anchor resources and non-anchor resources. This segmentation simplifies the measurement and reporting process by providing a clear hierarchy: anchor resources are measured and reported absolutely, while non-anchor resources are measured differentially relative to anchor resources, reducing computational complexity.
Solution Approach 2:
The network device performs preliminary configuration by designating anchor resources and non-anchor resources before the measurement process. This preliminary action provides the UE with clear measurement guidelines, reducing the complexity of real-time measurement and reporting decisions.
Data Source
AI summary
A method of wireless communication by a first user equipment (UE), includes receiving downlink signals from a network device. The method also includes receiving cross-link interference (CLI) to the downlink signals, the cross-link interference originating from a second UE. The method further includes receiving a configuration for a report of multiple differential cross-link interference metric values measured for multiple different cross-link interference resources and an absolute cross-link interference metric value measured for the different CLI resources. The method includes transmitting the report of the differential cross-link interference metric values measured for the different CLI resources.