Intra-Cell UE-to-UE CLI Measurement in Full-Duplex FDD
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Solution Overview
Problem
In wireless communication networks operating in full-duplex mode, intra-cell UE-to-UE cross-link interference (CLI) occurs due to uplink transmissions from one UE interfering with downlink receptions of another UE within the same cell, leading to potential interruptions and inefficiencies.
Innovation Solution
Victim UEs measure intra-cell CLI by using resources allocated to aggressor UEs for uplink traffic or reference signals, reporting these measurements to the base station, which adjusts scheduling to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex operation is implemented to enable simultaneous uplink and downlink transmissions, then spectral efficiency and latency are improved, but intra-cell UE-to-UE cross-link interference occurs
Solution Approach 1:
The system performs preliminary CLI measurement and reporting before scheduling downlink transmissions. The victim UE measures CLI on uplink resources allocated to aggressor UEs, reports measurements to the base station, and receives scheduling decisions that prevent or mitigate interference before it affects downlink reception
Solution Approach 2:
The system establishes a feedback loop where victim UEs continuously measure CLI levels on uplink resources, report these measurements to the base station, and the base station uses this feedback to dynamically adjust resource allocation and scheduling decisions to minimize interference
2Productivity
If resources are allocated to aggressor UEs for uplink transmission, then uplink capacity is improved, but downlink reception of victim UEs is degraded due to CLI
Solution Approach 1:
The base station allocates uplink resources to aggressor UEs with the preliminary understanding that victim UEs will measure CLI on these resources. This advance measurement enables the base station to make informed scheduling decisions that balance uplink capacity needs with downlink reception quality
Solution Approach 2:
The system dynamically adjusts resource allocation between aggressor and victim UEs based on real-time CLI measurements. The base station can reconfigure resource assignments, change scheduling parameters, or adjust power levels to optimize the trade-off between uplink capacity and downlink reception quality
3Reliability
If victim UEs measure CLI on uplink resources, then interference management is improved, but additional measurement overhead and processing complexity are introduced
Solution Approach 1:
The system uses existing uplink resources allocated to aggressor UEs for dual purposes: normal uplink transmission by aggressor UEs and CLI measurement by victim UEs. This multi-functionality of existing resources avoids the need for dedicated measurement resources and reduces overall system complexity
Solution Approach 2:
Victim UEs autonomously perform CLI measurements on their own behalf using readily available uplink resources. Each victim UE independently measures CLI, generates reports, and triggers scheduling requests, reducing the need for complex centralized control and coordination
Data Source
AI summary
Methods and systems are disclosed for a UE to manage and measure intra-cell cross link interference (CLI) when served by a base station operating in full-duplex FDD. The signaling may indicate to a victim UE resources to measure to determine the level of CLI from aggressor UEs. The resources used for the CLI measurement may be resources not scheduled by the base station for use by the victim UE for downlink reception, but are scheduled for use by the aggressor UEs for transmitting uplink traffic or for transmitting reference signals used to characterize the uplink channel. The victim UE may report the CLI measurements to the base station for the base station to adjust scheduling of downlink resources to the victim UE. In one aspect, the signaling from the base station may indicate to the victim UE the locations of scheduled downlink symbols that may potentially be impacted by CLI.