CSI-RS Transmission Pattern Configuration for 3D MIMO
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Solution Overview
Problem
Current LTE systems are limited in their ability to support three-dimensional MIMO operations with 2D antenna arrays, as they can only transmit channel state information reference signals (CSI-RS) from up to 8 antenna ports, which restricts the potential for full-dimensional MIMO capabilities and efficient beamforming.
Innovation Solution
The method involves configuring CSI-RS transmission patterns using a flexible number of antenna ports by grouping them into subsets, allowing for the indication of resource configurations for each subset, which enables the transmission of CSI-RS from more than 8 antenna ports, thereby supporting more complex MIMO operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CSI-RS transmission is limited to up to 8 antenna ports in conventional LTE systems, then system compatibility and ease of operation are maintained, but full-dimensional MIMO capabilities and beamforming efficiency are restricted
Solution Approach 1:
The patent divides the antenna array into multiple subsets, where each subset is associated with a specific CSI-RS resource configuration. This segmentation allows the system to support more than 8 antenna ports by organizing them into manageable groups, each with its own resource allocation pattern, thereby enabling full-dimensional MIMO while maintaining systematic configuration management.
Solution Approach 2:
The patent extends the traditional one-dimensional (horizontal) antenna array configuration to two-dimensional arrays by introducing vertical domain antenna ports. This dimensional expansion enables 3D beamforming and full-dimensional MIMO operations, allowing the system to exploit spatial resources in both azimuth and elevation domains simultaneously.
2Productivity
If the number of CSI-RS antenna ports is increased beyond 8 to support 2D antenna arrays, then full MIMO capability and beamforming efficiency are improved, but resource configuration complexity increases
Solution Approach 1:
The patent defines a unified resource configuration structure that can accommodate multiple antenna port subsets. Each resource configuration object contains parameters that are universally applicable to different subset sizes and arrangements, allowing the same configuration framework to support various MIMO modes (horizontal, vertical, and 3D beamforming) without requiring separate dedicated configurations for each mode.
Solution Approach 2:
The patent introduces configurable parameters such as subset size, resource block allocation, and port mapping relationships that can be dynamically adjusted. By changing these parameters, the system can adapt the resource configuration to match different antenna array sizes and MIMO operation modes, thereby supporting enhanced productivity without permanently increasing structural complexity.
3Ease of operation
If conventional one-dimensional antenna arrays are used, then system simplicity and ease of manufacture are maintained, but beamforming flexibility in the vertical domain is limited
Solution Approach 1:
The patent transitions from one-dimensional horizontal antenna arrays to two-dimensional arrays by adding vertical domain antenna ports. This dimensional change enables independent beamforming control in both azimuth and elevation directions, providing comprehensive 3D beamforming flexibility while maintaining a structured array configuration that builds upon conventional LTE antenna designs.
Data Source
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AI summary
Embodiments of the present disclosure provide a method for configuring transmission pattern in a wireless system. The method comprises indicating a number of antenna ports to be used for the transmission pattern; and configuring transmission resource for the number of antenna ports by indicating K resource configurations, with each resource configuration indicating resource for one of K subsets of antenna ports which form a set of the number of antenna ports. A method for signal detection according to the transmission pattern is also provided. Embodiments of the present disclosure also provide corresponding apparatus.