Downlink Resource Blanking for Neighbor Cell CSI-RS Measurement
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, the measurement quality of neighbor cell CSI-RS is degraded due to timing offsets between serving and neighbor cells, leading to interference and impaired reference signal measurements.
Innovation Solution
Implementing downlink resource blanking by allowing the UE to indicate to the serving cell which resources to enable or disable based on timing comparisons, allowing the UE to use neighbor cell timing for sampling without interference from the serving cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE uses a single sampling window for both serving cell and neighbor cell signals, then the device complexity is reduced, but the measurement precision of neighbor cell CSI-RS is degraded due to timing offsets
Solution Approach 1:
The patent divides the sampling process into two separate sampling windows: a first sampling window for serving cell signals and a second sampling window for neighbor cell signals. This segmentation allows each window to be optimized for its specific timing requirements, resolving the contradiction between device complexity and measurement precision by avoiding the need for a single complex adaptive window while maintaining accurate measurements through dedicated windows.
2Productivity
If the serving cell transmits downlink signals continuously, then the resource utilization is maximized, but intra-frequency interference occurs that degrades neighbor cell measurements
Solution Approach 1:
The patent extracts and removes serving cell downlink transmissions from specific time-frequency resources that overlap with neighbor cell CSI-RS transmissions. By taking out these interfering transmissions and replacing them with blanking resources, the system eliminates intra-frequency interference while maintaining resource utilization in non-overlapping periods, thus resolving the contradiction between productivity and harmful interference.
Solution Approach 2:
The patent applies preliminary anti-action by proactively blanking serving cell resources in advance of potential interference with neighbor cell measurements. The network entity identifies overlapping resources before transmission and pre-configures blanking resources to prevent interference from occurring, rather than attempting to mitigate it after the fact. This resolves the contradiction by preventing harmful interference while maintaining overall resource efficiency.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for downlink resource blanking. A method that may be performed by a user equipment (UE) includes receiving one or more first signals from a first cell and one or more second signals from a second cell within a sampling window, comparing a first timing of the one or more first signals with a second timing of the one or more second signals, and transmitting, to the first cell, an indication of whether to enable or disable blanking of one or more resources based on the comparison.