Per-Subband Beam Reporting for Cross-Link Interference Mitigation
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Solution Overview
Problem
Conventional beam management reports in wireless communication systems fail to distinguish between multiple frequency bands used by full duplex base stations, leading to ineffective interference management and reduced communication quality due to cross-link interference.
Innovation Solution
Implement a CLI-aware L1 subband beam management report that allows user equipment to perform interference measurements using channel and interference management resources across multiple subbands and beams, providing indications of preferred beams and subbands to the base station to reduce cross-link interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional beam management reports are used, then device complexity is reduced, but measurement precision deteriorates due to inability to distinguish multiple frequency bands
Solution Approach 1:
The beam management report is segmented into per-subband components, where each subband report contains beam measurements specific to that frequency subband. This segmentation allows the UE to provide differentiated interference measurements for multiple frequency bands used by full duplex base stations, thereby improving measurement precision without requiring a completely new reporting mechanism
Solution Approach 2:
The reporting structure adds a frequency dimension (subband indexing) to the traditional beam management report. By organizing measurements along the frequency dimension rather than only spatial dimension, the system can distinguish interference characteristics across multiple frequency bands while maintaining the existing report framework
2Reliability
If per-subband beam reports are implemented, then interference management improves, but device complexity increases due to multiple CMR and IMR measurements
Solution Approach 1:
The base station performs preliminary configuration by assigning specific CMR and IMR resources to each subband before the UE performs measurements. This preliminary resource assignment simplifies the UE's measurement process, as the device only needs to measure pre-configured resources rather than autonomously identifying them, thereby improving reliability without proportionally increasing device complexity
Solution Approach 2:
The system enables self-service interference management where the UE autonomously generates per-subband beam reports based on its own measurements of CMR and IMR resources. The base station then uses these self-generated reports to make scheduling decisions, reducing the need for complex network-side interference management mechanisms
3Reliability
If multiple CMR and IMR resources are measured, then communication quality improves, but loss of time increases due to extended measurement and reporting process
Solution Approach 1:
The per-subband beam measurements for multiple CMR and IMR resources are merged into a single unified report structure. By combining multiple measurements that would otherwise require separate reporting events into one consolidated report, the system improves communication quality through comprehensive interference assessment while minimizing the time loss associated with multiple sequential reporting processes
Data Source
AI summary
In certain aspects, the disclosure is directed to a user equipment (UE) configured to provide a report of interference (e.g., cross-link interference) between the UE and another UE when receiving a downlink transmission from a full duplex base station. In some examples, the UE may obtain, from the base station, a first channel measurement resource (CMR) via a first beam over a first subband, and a second CMR via a second beam over a second subband. In some examples, the UE may obtain, from another UE, a first interference management resource (IMR) via the first subband, and a second IMR via the second subband. Based on the CMR and IMR, the UE may generate a report indicating detected interference.