Linked CSI-RS Resources for Sub-Band Full Duplex Channel Estimation
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Solution Overview
Problem
In sub-band full duplex (SBFD) communication, it is challenging to allocate channel state information (CSI) reference signal (CSI-RS) resources for downlink channel estimation across multiple downlink sub-bands due to frequency domain separation.
Innovation Solution
A linked pair of CSI-RS resources is configured for SBFD symbols, comprising a first CSI-RS resource on a first downlink sub-band and a second CSI-RS resource on a second downlink sub-band, allowing measurements from both CSI-RS resources to be used together for CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If CSI-RS resources are allocated separately for each downlink sub-band in SBFD communication, then resource allocation simplicity is maintained, but channel estimation accuracy deteriorates due to frequency domain separation
Solution Approach 1:
The patent merges CSI-RS resources from multiple downlink sub-bands into a unified resource configuration. By linking CSI-RS resources across frequency-separated sub-bands, the system enables combined channel estimation that overcomes the limitations of separate allocation while maintaining resource management simplicity through a single configuration structure.
2Productivity
If multiple downlink sub-bands are used in SBFD communication, then spectral efficiency is improved, but CSI-RS resource allocation complexity increases due to frequency domain separation
Solution Approach 1:
The patent creates a universal CSI-RS resource configuration that functions across multiple downlink sub-bands simultaneously. This multi-functional resource allocation mechanism allows the same configuration structure to serve frequency-separated sub-bands, enabling spectral efficiency gains without proportionally increasing allocation complexity.
3Measurement precision
If CSI-RS resources are linked across frequency-separated sub-bands, then channel estimation accuracy is improved, but resource configuration complexity increases
Solution Approach 1:
The patent introduces a new configuration dimension for CSI-RS resources that explicitly accounts for frequency domain separation in SBFD systems. By adding this dimensional parameter to the resource configuration, the system enables accurate cross-sub-band channel estimation while managing complexity through structured parameterization rather than unstructured resource management.
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 channel state information (CSI) resource configuration indicating a linked pair of CSI reference signal (CSI-RS) resources for sub-band full duplex (SBFD) symbols, the linked pair of CSI-RS resources including a first CSI-RS resource on a first downlink sub-band and a second CSI-RS resource on a second downlink sub-band. The UE may receive a first CSI-RS in the first CSI-RS resource on the first downlink sub-band and a second CSI-RS in the second CSI-RS resource on the second downlink sub-band. The UE may transmit a CSI report including at least one CSI metric associated with measurements of the first CSI-RS and the second CSI-RS. Numerous other aspects are described.