Beam Pair Selection Using CLI Framework for Self-Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing cross-link interference (CLI) in flexible TDD configurations, particularly in enabling full duplex (FD) communication, which leads to interference between uplink and downlink transmissions, especially in dynamic TDD scenarios.
Innovation Solution
A cross-link interference (CLI) framework is utilized for self-interference measurement (SIM) procedures, allowing devices to measure and select optimal Tx/Rx beam pairs to minimize CLI, enabling efficient full duplex communication by separating uplink and downlink transmissions using beamforming techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is enabled in dynamic TDD configurations, then communication efficiency and spectral utilization are improved, but cross-link interference between uplink and downlink transmissions increases
Solution Approach 1:
The patent segments the communication channels by introducing dedicated measurement resources (CLI-RSSI and CLI-SRS) separated from regular data transmission resources. This segmentation allows interference measurement to occur independently without disrupting full duplex communication, enabling the system to maintain high productivity while quantifying and managing cross-link interference through separate measurement occasions and resource allocations.
2Object-generated harmful factors
If beamforming techniques are used to separate uplink and downlink transmissions, then cross-link interference is reduced, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling user equipment to autonomously measure cross-link interference using dedicated CLI measurement resources and autonomously select beam pairs based on measured interference levels. The UE performs self-interference measurement and reports results to the network, eliminating the need for complex network-controlled beam management while reducing cross-link interference through UE-initiated beam selection based on measured conditions.
3Measurement precision
If self-interference measurement procedures are implemented, then optimal beam pair selection is achieved, but measurement and configuration complexity increases
Solution Approach 1:
The patent merges self-interference measurement with existing CLI measurement frameworks by reusing CLI measurement resources, reporting mechanisms, and configuration procedures. The SIM procedure is integrated into the existing CLI measurement architecture, allowing the system to perform both inter-UE CLI measurement and intra-UE self-interference measurement using unified resource allocations and reporting structures, thereby reducing overall measurement configuration complexity while maintaining measurement precision.
Data Source
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AI summary
The present disclosure provides for a configuration that enables an apparatus to determine beam pairs for full duplex communication based on a cross-link interference procedure. The apparatus determines a subset of receive beams based on a beam measurement process. The apparatus may perform a channel measurement process based on the subset of receive beams. The apparatus sweeps through transmitted sounding reference signals from a same transmit beam and receives the transmitted sounding reference signals incrementally through other receive beams associated with other antenna array panels. The apparatus measures self-interference for at least one beam pair based on a received sounding reference signal. The apparatus selects beam pairs based on a self-interference measurement or a signal-to-interference-plus-noise ratio.