CSI Resource Indicator Reporting for Cross-Link Interference Scheduling
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in accurately measuring and mitigating cross-link interference (CLI) between user equipment (UEs) due to the complexity and variability of interference types, which conventional techniques fail to account for, leading to suboptimal channel conditions, increased latency, and signaling overhead.
Innovation Solution
Configuring UEs to generate CSI reports that include channel characteristics accounting for CLI from multiple interference measurement resources (IMRs), allowing base stations to schedule UEs with low CLI for concurrent communication, thereby reducing interference and improving throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional CSI measurement techniques are used, then the measurement process is simple, but cross-link interference between UEs cannot be accurately measured and mitigated
Solution Approach 1:
The patent divides the interference measurement process into separate components: channel measurement resources (CMRs) for desired signal measurement and interference measurement resources (IMRs) for interference characterization. This segmentation allows precise CLI measurement by independently measuring interference from multiple UEs using dedicated IMRs configured with specific SRS or DMRS signals, while maintaining manageable complexity through structured resource allocation.
2Reliability
If multiple interference measurement resources are configured, then CLI mitigation is improved, but signaling overhead increases
Solution Approach 1:
The patent implements partial action by configuring a subset of IMRs corresponding to specific interfering UEs rather than all possible UEs. The base station selectively configures IMRs based on identified interference sources, measuring CLI only from relevant UEs. This approach improves reliability by addressing actual interference conditions while controlling signaling overhead through selective rather than comprehensive measurement configuration.
3Measurement precision
If CSI reports include comprehensive channel characteristics, then scheduling accuracy is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by having UEs perform interference measurements and generate CSI reports in advance before actual data transmission. The base station configures IMRs and collects CLI measurements beforehand, allowing scheduling decisions to be made based on pre-computed channel characteristics. This提前 measurement approach improves scheduling accuracy while managing processing time by performing computations before the critical transmission window.
Data Source
AI summary
A first user equipment (UE) receives a configuration of a channel state information (CSI) report from a base station. The configuration includes an indication of a sounding reference signal (SRS) or uplink demodulation reference signal (DMRS) transmitted from a second UE as an interference measurement resource (IMR). The base station configures the second UE to transmit the SRS or the uplink DMRS on the IMR. The first UE measures the IMR to determine a cross-link interference of the second UE to the first UE. The UE transmits the CSI report. The CSI report includes at least one channel characteristic that takes into account the cross-link interference of the second UE. The CSI report may include information for a plurality of CSI-RS resource indicators (CRIs), each CRI associated with a same channel measurement resource (CMR) and a different IMR corresponding to a different second UE.