Mixed Mode Joint Transmission CSI Reporting for Wireless Networks
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Solution Overview
Problem
Current wireless communication networks lack support for signaling, measuring, or reporting information used to enable mixed mode joint transmissions, which combine non-coherent and coherent joint transmissions, especially in scenarios with multiple transmit points and varying channel conditions.
Innovation Solution
The implementation of enhanced joint transmission operations that include mixed mode or type joint transmissions, allowing for non-coherent and coherent joint transmissions on a per-layer basis or across layers, along with CSI reporting enhancements to support reporting configurations for different combinations of coherent and non-coherent joint transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mixed mode joint transmissions combining non-coherent and coherent joint transmissions are implemented, then throughput and network performance are improved, but device complexity and signaling requirements increase
Solution Approach 1:
The joint transmission is segmented into multiple types (coherent and non-coherent) that can be independently configured and reported. The UE provides separate CSI reports for different joint transmission types, allowing the network to selectively combine them. This segmentation enables flexible composition of mixed mode transmissions without requiring the entire system to handle all complexity simultaneously.
Solution Approach 2:
The system dynamically selects and combines different joint transmission types (coherent and non-coherent) based on real-time channel conditions and network requirements. The UE can report CSI for multiple joint transmission types, and the network dynamically chooses the appropriate combination, making the system adaptable rather than static.
2Adaptability or versatility
If CSI reporting enhancements support multiple joint transmission types, then adaptability and flexibility are improved, but measurement and reporting overhead increase
Solution Approach 1:
Different CSI reporting configurations are provided for different joint transmission types (coherent and non-coherent) based on local requirements. The network can configure specific CSI-RS resources and reporting parameters tailored to each transmission type, rather than using a uniform approach for all transmissions.
Solution Approach 2:
The CSI reporting mechanism is designed to be universal, supporting multiple joint transmission types through a unified framework. The same basic CSI reporting structure can accommodate both coherent and non-coherent joint transmissions by configuring different parameters and resources, reducing the need for entirely separate reporting systems.
3Measurement precision
If multiple CSI-RS resources are configured for different joint transmission types, then measurement precision is improved, but network resource consumption increases
Solution Approach 1:
The network pre-configures multiple CSI-RS resources for different joint transmission types before actual data transmission. By having these measurement resources ready in advance, the system can quickly switch between different transmission types without needing to set up measurement resources on-demand, reducing signaling overhead and network resource consumption during active transmission.
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support joint transmission operations which include non-coherent and coherent joint transmissions. In a first aspect, an apparatus includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured receive an indication of channel state information (CSI) reference signal (RS) (CSI-RS) resources and transmit a CSI report based on the CSI resources. The CSI report includes precoding information and channel quality information. The at least one processor is configured to receive an indication of a joint transmission including a non-coherent joint transmission and a coherent joint transmission. The at least one processor is configured to receive the joint transmission corresponding to the indication. Other aspects and features are also claimed and described.