OCC Antenna Port Multiplexing for Full-Power CSI-RS Transmission
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Solution Overview
Problem
Current technologies face limitations in supporting full-power transmission of Non-zero power (NZP) Channel State Information Reference Signals (CSI-RS) with orthogonal cover code (OCC) based antenna multiplexing, particularly with 12 or more antenna ports, as they do not allow for full-power transmission without increasing the maximum power boosting beyond 6 dB.
Innovation Solution
The implementation of OCC-4 or OCC-8 based antenna port multiplexing within each CSI-RS resource configuration enables the aggregation of NZP CSI-RS resources across multiple antenna ports, allowing for full power transmission without exceeding the 6 dB power boosting limit, by spreading energy across multiple resource elements associated with respective antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If OCC based antenna multiplexing is used with 12 or more antenna ports, then channel estimation capability is improved, but power boosting exceeds 6 dB limit
Solution Approach 1:
The patent divides the 12 or more antenna ports into multiple groups, with each group containing fewer antenna ports that can be supported by existing OCC based multiplexing. This segmentation allows the system to handle more antenna ports overall while keeping each group's power boosting within the 6 dB limit, thus resolving the contradiction between channel estimation capability and power constraints.
2Productivity
If more antenna ports are supported, then MIMO system capacity is improved, but resource element requirements increase
Solution Approach 1:
The patent combines multiple CSI-RS resources across different antenna port groups into a unified channel estimation framework. By merging the channel estimates from multiple groups, the system achieves high MIMO capacity with 12 or more antenna ports while efficiently utilizing resource elements through the aggregation approach, rather than requiring separate dedicated resources for each antenna port.
Data Source
AI summary
Embodiments can provide an apparatus for a User Equipment (UE) for processing a Channel State Information Reference signal (CSI-RS) associated with a prescribed CSI-RS resource configuration, comprising CSI-RS resources, relating to a predetermined plurality of antenna ports; the apparatus comprising circuitry to: process data associated with the prescribed CSI-RS resource configuration relating to the predetermined plurality of antenna ports, said CSI-RS resource configuration comprising multiplexing data to provide an indication of the multiplexing of the CSI-RS signal over the CSI-RS resources; process data associated with a CSI-RS signal conveyed using the CSI-RS resources according to the CSI-RS resource configuration to support a channel estimation using the data associated with the CSI-RS signal.