CSI Resource Allocation in Subband Full Duplex Systems
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Solution Overview
Problem
Current channel state information (CSI) resource allocation in subband full duplex (SBFD) systems is limited by existing 3GPP standards, which restrict the number of CSI-RS resources and configurations, leading to reduced channel measurements and interference assessments, especially in DL subbands with UL subband overlap.
Innovation Solution
The introduction of new parameters and information elements, such as CSI-FrequencyOccupation2, allows for discontiguous CSI-RS resource configurations and skipping of measurements in overlapping slots, enabling more flexible and efficient CSI reporting by defining starting positions and resource block numbers for multiple partitions within SBFD slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing 3GPP standards are used for CSI resource allocation, then system compatibility is maintained, but the number of CSI-RS resources and configurations is limited
Solution Approach 1:
The patent segments the frequency domain into multiple partitions, allowing independent configuration of CSI-RS resources in each partition. This enables the system to support more CSI-RS resources by dividing the frequency spectrum into manageable segments, each with its own resource allocation parameters, thereby increasing configuration flexibility without overwhelming system complexity.
Solution Approach 2:
The patent introduces a new dimension for resource configuration by adding partition-specific parameters (starting position and number of resource blocks) to the existing CSI-RS resource configuration framework. This dimensional extension allows the system to accommodate more CSI-RS resources by utilizing frequency domain partitions, effectively increasing adaptability while maintaining a structured approach to complexity management.
2Productivity
If DL subbands with UL subband overlap are used in SBFD, then spectral efficiency is improved, but channel measurement accuracy is reduced
Solution Approach 1:
The patent divides the frequency domain into partitions, allowing the system to separately configure and measure CSI-RS resources in DL subbands that overlap with UL subbands. By segmenting the frequency resources, the system can perform accurate channel measurements in specific partitions while maintaining SBFD operation, thus preserving measurement precision while achieving spectral efficiency through overlapping subbands.
3Measurement precision
If more CSI-RS resources are allocated, then channel measurement accuracy is improved, but resource allocation complexity increases
Solution Approach 1:
The patent segments the frequency domain into multiple partitions, each with independently configurable CSI-RS resources. This segmentation allows the system to allocate more CSI-RS resources across different partitions without creating a single complex allocation structure. Each partition can be configured separately, reducing the overall complexity of resource management while enabling comprehensive channel measurements across the entire frequency spectrum.
Data Source
AI summary
A method of CSI resource allocation in a subband full duplex (SBFD) system is disclosed. The method can include receiving a channel state information (CSI) resource configuration from a base station in a subband full duplex (SBFD) system, the CSI resource configuration being associated with one or more CSI reference signal (CSI-RS) resource set including at least one CSI-RS resource, the CSI resource configuration indicating a first CSI-RS resource distribution and a second CSI-RS resource distribution, each CSI-RS resource distribution indicates one or more frequency domain starting position and one or more total number of resource blocks of one or more partition of the respective CSI-RS resource set in CSI transmission slots, performing a channel measurement based on the one or more CSI-RS resource set and the CSI resource configuration, and transmitting a CSI report to the base station based on the channel measurement.