Frequency Resource Allocation for CSI-RS in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems, such as LTE Rel. 14 and NR, lack a determined frequency scheduling scheme for CSI-RS transmission, which affects efficient channel estimation and interference measurement.
Innovation Solution
The proposed solution involves allocating partial frequency resources to CSI-RS, CSI-Interference Measurement, and Zero Power CSI-RS, allowing for flexible and efficient resource allocation in wireless communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If beamforming is applied to CSI-RS to reduce overhead and increase coverage, then coverage and beamforming gain are improved, but frequency scheduling scheme becomes undetermined and resource allocation flexibility is reduced
Solution Approach 1:
The system bandwidth is divided into multiple subbands, and CSI-RS resources are allocated to different subbands. This segmentation allows beamformed CSI-RS to be transmitted in specific frequency regions while maintaining scheduling flexibility for other bands, resolving the contradiction between coverage enhancement and frequency scheduling adaptability.
Solution Approach 2:
The patent introduces dynamic frequency scheduling for beamformed CSI-RS by allowing the network to flexibly configure and reconfigure frequency resources based on channel conditions and traffic requirements. This dynamic allocation maintains the beamforming coverage benefits while adapting to changing system demands.
2Measurement precision
If CSI-RS is transmitted in all resource blocks, then channel estimation accuracy is improved, but resource overhead increases
Solution Approach 1:
Instead of uniformly transmitting CSI-RS across all resource blocks, the patent applies local quality by transmitting beamformed CSI-RS in specific subbands where it provides the most benefit. This localized approach maintains channel estimation accuracy in critical frequency regions while reducing overall resource overhead.
Solution Approach 2:
The system transmits CSI-RS in a partial set of resource blocks (specific subbands) rather than all resource blocks. This partial action is sufficient to achieve effective channel estimation for the scheduled data transmissions while significantly reducing the overhead compared to full-bandwidth CSI-RS transmission.
3Power
If frequency scheduling is not determined for CSI-RS, then beamforming gain is maintained, but resource allocation efficiency and system performance deteriorate
Solution Approach 1:
The patent creates a universal frequency scheduling framework that works with beamformed CSI-RS by defining flexible resource allocation mechanisms applicable to different scenarios. This multi-functional approach allows the system to maintain beamforming gains while achieving efficient resource allocation through unified scheduling principles.
Data Source
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AI summary
A user equipment (UE) (10) comprising a receiving section (1031) configured to receive, by higher layer signaling, information indicating a resource including at least one of a reference signal resource for channel measurement and a resource for interference measurement; a control section (104) configured to perform, based on the information, at least one of channel measurement and interference measurement; and a transmitting section (1031) configured to transmit feedback information based on at least one of the channel measurement and the interference measurement, wherein the resource including at least one of the reference signal resource for the channel measurement and the resource for the interference measurement is allocated to one or more frequency resources within a carrier bandwidth part.