Cell-Level CLI-SRS Configuration for Full-Duplex Interference Measurement
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Solution Overview
Problem
Current wireless communication systems face challenges in effectively measuring cross-link interference (CLI) in full-duplex slots, particularly for both Uu and sidelink communications, which affects the reliability of simultaneous downlink and uplink communications.
Innovation Solution
Implementing a cell-level CLI sounding reference signal (CLI-SRS) configuration that identifies CLI-SRS resources in full-duplex slots, allowing UEs to receive indications for transmitting or measuring CLI, thereby facilitating cross-link interference assessments during Uu and sidelink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex slots are used for simultaneous downlink and uplink communications, then spectral efficiency and resource utilization are improved, but cross-link interference between Uu and sidelink communications increases
Solution Approach 1:
The patent applies preliminary action by configuring CLI-SRS resources in advance within full-duplex slots before actual communications occur. The base station pre-allocates specific time-frequency resources for CLI measurements, enabling UEs to perform interference assessments proactively. This allows the system to prepare measurement opportunities beforehand, ensuring that CLI can be measured and mitigated before interference degrades communication reliability, thus maintaining high spectral efficiency while managing interference.
Solution Approach 2:
The patent introduces CLI-SRS as an intermediary mechanism that mediates between simultaneous Uu and sidelink communications. This special reference signal acts as a probe that indirectly measures the interference level between the two communication types without disrupting their normal operation. By using this intermediary measurement approach, the system can assess cross-link interference while maintaining the full-duplex operational mode, thus preserving spectral efficiency while enabling interference management.
2Reliability
If CLI measurements are performed in full-duplex slots, then interference mitigation capability is improved, but measurement precision is degraded due to simultaneous transmissions
Solution Approach 1:
The patent applies segmentation by dividing the full-duplex slot into distinct resource regions: some resources are allocated for Uu communications, others for sidelink communications, and specific CLI-SRS resources for interference measurement. This segmentation allows the system to isolate measurement resources from data transmission resources, enabling more accurate CLI measurements even in the presence of simultaneous transmissions. The separated resource allocation reduces measurement contamination while maintaining full-duplex operation.
Solution Approach 2:
The patent extracts the CLI measurement function from the regular data transmission resources by dedicating specific CLI-SRS resources solely for interference measurement. This extraction creates specialized measurement opportunities that are independent of the actual communication data, allowing for more precise interference assessment. By separating the measurement function from the communication function, the system improves measurement precision while maintaining the ability to perform interference mitigation.
3Adaptability or versatility
If cell-level CLI-SRS configuration is implemented for both Uu and sidelink communications, then resource management capability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing a cell-level CLI-SRS configuration framework that serves multiple communication types (Uu and sidelink) simultaneously. Instead of creating separate measurement mechanisms for each communication type, the system uses a unified configuration approach where a single CLI-SRS resource configuration can support both Uu and sidelink CLI measurements. This multi-functional design improves resource management capability while avoiding the complexity of implementing separate measurement systems for each communication type.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a cell-level cross link interference sounding reference signal (CLI-SRS) configuration, wherein the cell-level CLI-SRS configuration identifies CLI-SRS resources in one or more full-duplex slots for cross link interference measurements associated with Uu and sidelink communications. The UE may receive an indication to transmit a CLI-SRS, or to measure cross link interference, in a CLI-SRS resource of the CLI-SRS resources identified in the cell-level CLI-SRS configuration. The UE may transmit the CLI-SRS in the CLI-SRS resource or measuring cross-link interference in connection with a CLI-SRS transmission from another UE in the CLI-SRS resource based at least in part on the indication. Numerous other aspects are described.