Non-Contiguous Resources for Cross-Link Interference Mitigation
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Solution Overview
Problem
In wireless communication systems, subband full duplex (SBFD) configurations lead to cross-link interference (CLI) and inaccurate channel state information (CSI) reporting due to leakage between uplink and downlink resource blocks, resulting in reduced communication quality and reliability.
Innovation Solution
Configuring non-contiguous measurement resources in frequency, specifically excluding uplink resource blocks from the measurement resource, to improve the accuracy of CLI and CSI reports, thereby enhancing communication quality and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If subband full duplex (SBFD) configurations are used to support simultaneous uplink and downlink communications, then spectral efficiency and communication capacity are improved, but cross-link interference (CLI) occurs due to leakage between uplink and downlink resource blocks
Solution Approach 1:
The patent extracts and excludes uplink resource blocks from the measurement resource configuration. By specifically identifying and removing the portions of frequency resources that are allocated to uplink transmissions from the set of resources used for downlink measurements, the system eliminates the source of cross-link interference while preserving the beneficial simultaneous uplink-downlink operation of SBFD
Solution Approach 2:
The patent applies local quality by making the measurement resource configuration non-uniform across the frequency spectrum. Instead of using a uniform contiguous allocation, the system creates a non-contiguous measurement resource that has different properties (excluded uplink RBs) in different frequency regions, allowing accurate measurements in downlink regions while avoiding interference from uplink regions
2Device complexity
If contiguous measurement resources are used for CLI and CSI reports, then measurement configuration is simple, but measurement accuracy is reduced due to inclusion of uplink resource blocks with interference
Solution Approach 1:
The patent segments the measurement resource in the frequency domain by creating a non-contiguous allocation that excludes specific uplink resource blocks. This segmentation divides the measurement resource into multiple separate frequency regions, allowing the system to perform measurements only in downlink regions free from uplink interference, thereby improving measurement accuracy
Solution Approach 2:
The patent changes the frequency domain parameters of the measurement resource from a contiguous allocation to a non-contiguous allocation. By modifying the resource configuration parameters to specify non-contiguous resource blocks and adjusting the frequency location parameters to exclude uplink regions, the system improves measurement accuracy while maintaining manageable configuration complexity
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 configuration for a resource associated with cross-link interference (CLI). The resource is associated with subband full duplex and is non-contiguous in frequency. The UE may receive a configuration for a report associated with the resource. The UE may perform a measurement using the resource associated with CLI. The UE may transmit a report associated with the measurement. Numerous other aspects are described.