Subband Full-Duplex CLI Measurement Configuration
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately measuring and mitigating cross-link interference (CLI) in subband full-duplex (SBFD) operations, particularly in configuring CLI measurement resources and reporting across overlapping subbands, which affects communication performance.
Innovation Solution
The system configures CLI measurement resources within SBFD time resources, allowing network entities to indicate specific subbands for measurement and reporting, enabling separate or combined measurement of CLI across downlink, uplink, and guard bands, and specifies the types of information to be included in CLI reports, such as RSSI or RSRP values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CLI measurement resources are configured to span multiple frequency resources including guard bands, then measurement precision is improved, but device complexity increases due to overlapping subband configurations
Solution Approach 1:
The patent divides the frequency spectrum into separate downlink subbands and uplink subbands with guard bands in between. CLI measurement resources are configured to span multiple frequency resources including both downlink and uplink subbands. The network entity indicates specific subbands for measurement, allowing the system to segment the measurement process across different frequency regions while maintaining overall measurement accuracy.
Solution Approach 2:
The patent extends CLI measurement from single-subband measurements to multi-subband measurements by configuring measurement resources that span across frequency dimensions. The network entity provides indications for multiple subbands, transforming the measurement approach from one-dimensional (single subband) to multi-dimensional (multiple overlapping subbands including guard bands), thereby improving measurement precision while managing complexity through structured configuration.
2Measurement precision
If separate CLI measurements are performed for each subband, then measurement precision is improved, but loss of time increases due to multiple reporting instances
Solution Approach 1:
The patent combines multiple subband-specific CLI measurements into unified CLI reports. The network entity configures CLI measurement resources that span multiple frequency resources, and the UE performs measurements across these resources. Instead of separate reporting for each subband, the measurements are merged into consolidated reports that include CLI information for multiple subbands, thereby reducing the number of reporting instances and time loss while maintaining subband-specific measurement precision.
3Object-affected harmful factors
If guard band size is increased to reduce CLI, then object-affected harmful factors are reduced, but area of frequency resources decreases
Solution Approach 1:
The patent replaces the traditional mechanical approach of simply increasing guard band size to reduce CLI with a signal processing approach. Instead of relying solely on frequency separation through larger guard bands, the system uses CLI measurement and reporting mechanisms that identify and characterize interference sources. The network entity uses the measurement information to implement interference mitigation strategies, substituting the need for excessively large guard bands with intelligent measurement and control systems.
Solution Approach 2:
The patent changes the approach from static guard band sizing to dynamic CLI management through measurement and reporting. By configuring CLI measurement resources that span multiple frequency resources including guard bands, the system can dynamically adjust and optimize guard band utilization based on actual CLI conditions. This allows for more efficient use of frequency resources while maintaining adequate CLI protection through adaptive parameter adjustment.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A wireless communications system may employ subband full-duplex (SBFD). In SBFD resources, a first user equipment (UE) may experience cross link interference (CLI) from a second UE if the second UE transmits using a frequency that is similar to a frequency of the subbands used by the first UE. The network may configure a CLI measurement resource in an SBFD time resource and may indicate in which subbands to measure CLI. The network may also indicate the reporting quantities (e.g., whether to report CLI measurement information per subband or combined per communication direction). CLI measurements may be generated in a subband manner. A CLI measurement for a CLI subband that overlaps with different subbands may be generated for the uplink subband only, may be generated for both the uplink subband and the guard band, or may be skipped.