CSI-RS Port Selection Codebook With Channel Reciprocity
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing resource allocation for CSI-RS, necessitating improvements to reduce overhead and enhance flexibility.
Innovation Solution
Implementing a cellular base station and wireless device configuration that provides RRC messages to manage CSI-RS allocation through density, time domain locations, and CDM groups, allowing for precise control over CSI-RS transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI-RS is transmitted with high density and on all ports, then measurement accuracy is improved, but resource overhead increases
Solution Approach 1:
The patent segments the CSI-RS measurement process by dividing ports into subsets and CDM groups into subsets. The network configures multiple port subsets and CDM group subsets, allowing the UE to perform measurements on selected subsets rather than all ports, thereby reducing resource overhead while maintaining measurement accuracy through targeted measurements.
Solution Approach 2:
The patent applies local quality by allowing different density configurations for different CDM groups and port subsets. The network can configure specific density values (e.g., densityPerCDMGroup) for different groups, enabling optimized resource allocation where high density is applied only where necessary for accurate measurement, rather than uniformly across all ports.
2Adaptability or versatility
If CSI-RS resource allocation is made flexible and configurable, then adaptability is improved, but system complexity increases
Solution Approach 1:
The patent introduces dynamic configurability through RRC parameters that allow the network to flexibly adjust CSI-RS allocation. The network can dynamically configure port subsets, CDM group subsets, density per CDM group, and time domain locations based on channel conditions and traffic requirements, making the system adaptable without requiring complex reconfiguration of the entire measurement framework.
Solution Approach 2:
The patent creates a universal measurement framework that can handle multiple scenarios through a single configurable system. The same RRC configuration mechanism supports different density values, different port subset combinations, different CDM group subset configurations, and various time domain locations, providing multi-functionality through a unified approach rather than separate mechanisms for each scenario.
Data Source
AI summary
The present disclosure relates to apparatus, methods, computer-readable storage medium and computer program product for CSI-RS enhancement for Port Selection Codebook with Channel Reciprocity. A cellular base station, comprising: at least one antenna; at least one radio coupled to the at least one antenna; and a processor coupled to the at least one radio; wherein the cellular base station is configured to: provide a Radio Resource Control (RRC) message to a wireless device; and provide a Channel State Information-Reference Signal (CSI-RS) to the wireless device via one or more ports based on the RRC message, wherein, the RRC message at least indicates one or more of: information on a density of the CSI-RS, information on time domain locations of the CSI-RS, information on a subset of ports for the wireless device to measure the CSI-RS, and information on a subset of Code Division Multiplexing (CDM) groups for the wireless device to measure the CSI-RS.