Timing Offset Signaling for Cross-Link Interference Measurement
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately measuring cross-link interference (CLI) due to the lack of precise timing offset information, which affects the accuracy of SRS-RSRP measurements and subsequent CLI mitigation.
Innovation Solution
The proposed solution involves signaling of UE TX-RX timing offset for SRS-RSRP based CLI measurements, using methods such as signaling timing offset as part of SRS configuration, SRS sequence based timing offset signaling, and MAC CE signaling for timely reporting and reconfiguration of timing offsets to enable accurate SRS-RSRP measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If timing offset information is not signaled, then the system complexity is reduced, but the measurement precision of SRS-RSRP deteriorates
Solution Approach 1:
The patent introduces timing offset information as an intermediary parameter that mediates between the UE transmission timing and the gNB reception timing. This timing offset acts as a mediator that enables accurate alignment and measurement of SRS signals across different cells, resolving the measurement precision issue without requiring fundamental system changes.
Solution Approach 2:
The patent applies preliminary action by signaling the timing offset information before performing SRS-RSRP measurements. The timing offset is configured and communicated to the UE in advance, allowing the UE to properly time its SRS transmissions. This preliminary timing alignment enables subsequent measurements to be performed with high precision.
2Reliability
If timing offset signaling is implemented, then the CLI mitigation effectiveness is improved, but the information loss in timing offset reporting increases
Solution Approach 1:
The patent changes the parameter representation by introducing different formats for timing offset reporting (e.g., absolute timing offset, differential timing offset, quantized timing offset). These parameter changes allow the system to balance between reporting accuracy and information loss, enabling reliable CLI mitigation while managing the amount of information that needs to be transmitted.
3Measurement precision
If precise timing offset information is available, then the SRS-RSRP measurement accuracy is improved, but the difficulty of detecting and measuring CLI increases
Solution Approach 1:
The patent segments the CLI measurement process into distinct phases: timing offset determination, SRS transmission with applied timing offset, and RSRP measurement. This segmentation allows each phase to be handled separately with appropriate methods, reducing the overall complexity despite the need for high precision measurements.
Data Source
AI summary
An approach is described for a source device associated with a source cell, where the source device includes radio front end circuitry and processor circuitry coupled to the radio front end circuitry. The processor circuitry is configured to transmit configuration information to a user equipment (UE); transmit a request for a transmission or receiving time offset (TO) to the UE; receive the transmission or receiving TO from the EE. The processor circuitry is further configured to transmit the configuration information and the transmission or receiving TO to a second source device associated with a second source cell for a CLI reference signal measurement, wherein the EE is associated with the source cell, and the configuration information comprises an SRS instruction for the EE to enable an uplink (EE) CSI acquisition or tracking.