32-Port CSI-RS Aggregation Using CDM-8 Multiplexing
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving channel state information (CSI) due to resource limitations and overhead issues, particularly in aggregating CSI-RS resources and achieving full power transmission.
Innovation Solution
A method for receiving CSI-RS in a wireless communication system involves configuring a 32-port CSI-RS configuration by aggregating four 8-port CSI-RS configurations and applying a code division multiplexing (CDM)-8 pattern, which allows for full power transmission by optimizing the use of antenna ports and resource elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple CSI-RS resources are aggregated to support more antenna ports, then the number of supported antenna ports increases, but overhead increases
Solution Approach 1:
The patent combines multiple CSI-RS resources (first and second CSI-RS resources) into a single aggregated CSI-RS resource that supports a larger number of antenna ports. By merging these resources and applying CDM patterns, the system achieves support for more antenna ports while reducing the overhead associated with separate resource configurations.
Solution Approach 2:
The aggregated CSI-RS resource serves multiple functions simultaneously - it supports channel state information acquisition for multiple antenna ports while also enabling full-power transmission. The CDM pattern allows the same time-frequency resources to be shared across multiple antenna ports, making the resource universal rather than dedicated to single ports.
2Power
If CDM pattern is applied to aggregated CSI-RS resources, then full power transmission is achieved, but resource element allocation becomes complex
Solution Approach 1:
The patent segments the antenna ports into different groups (first set and second set of antenna ports) and applies different CDM patterns to each group. This segmentation allows systematic management of resource elements while achieving full-power transmission across all ports. The segmented approach simplifies the complexity by providing a structured method for resource allocation.
Solution Approach 2:
The patent changes the CDM pattern parameters (specifically CDM-4 and CDM-8 patterns with different orthogonal cover codes) to enable full-power transmission. By adjusting these parameters and selecting appropriate patterns for different antenna port sets, the system achieves maximum transmission power while managing resource element allocation through parameter optimization rather than complex structural changes.
Data Source
AI summary
An aspect of the present invention provides a method for receiving a channel state information-reference signal (CSI-RS) by a terminal in a wireless communication system, the method comprising the steps of: receiving, from a base station, CSI-RS configuration information indicating a CSI-RS configuration about mapping of the CSI-RS; and receiving, from the base station, the CSI-RS which is transmitted through multiple antenna ports, on the basis of the received CSI-RS configuration information, wherein, when the CSI-RS configuration is a 32-port CSI-RS configuration into which four 8-port CSI-RS configurations are aggregated, a code division multiplexing (CDM)-8 pattern, in which the number of orthogonal weight vectors is 8, is applied to the 32-port CSI-RS configuration, wherein the CDM-8 pattern may be applied to one resource element (RE)-pair selected for each of the aggregated 8-port CSI-RS configurations.