Port-Group Precoding Sets for Multi-TRP CJT Channel Estimation
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Solution Overview
Problem
Existing communication technologies face challenges in improving channel estimation and reporting for coherent joint transmission (CJT) with multiple transmission reception points (M-TRPs), particularly in cells with large numbers of users and distributed remote radio heads, and lack flexibility in supporting TRPs with different numbers of antenna ports.
Innovation Solution
The solution involves configuring port groups for CSI-RS resources, allowing separate determination of precoding parameters for each TRP and a joint determination of common parameters across TRPs, enabling enhanced Type II codebook support for multi-TRP scenarios, and reducing reporting overhead through cyclic shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate determination of port group-specific precoding parameters is performed for each TRP, then channel estimation precision for multi-TRP is improved, but device complexity increases
Solution Approach 1:
The patent segments the precoding parameters into two categories: port group-specific parameters (separately determined for each TRP) and common parameters (jointly determined across TRPs). This segmentation allows the system to achieve high channel estimation precision for each TRP while managing complexity by identifying and reusing common parameters across multiple TRPs, thereby avoiding redundant computations.
Solution Approach 2:
The patent introduces common precoding parameters that serve multiple TRPs simultaneously. These common parameters are determined jointly across all TRPs and can be reused in the precoding operation for each individual TRP, thereby reducing the overall computational complexity while maintaining accurate channel estimation for all TRPs.
2Device complexity
If joint determination of common precoding parameters across TRPs is performed, then device complexity is reduced, but measurement precision for individual TRP channels deteriorates
Solution Approach 1:
The patent segments the precoding parameter determination into two independent parts: separate determination of port group-specific parameters (which maintains individual TRP channel estimation precision) and joint determination of common parameters (which reduces overall complexity). This segmentation allows both objectives to be achieved simultaneously without compromise.
Solution Approach 2:
The patent applies different determination methods to different parameter sets based on their local requirements: port group-specific parameters are determined separately to maintain high precision for each TRP's local channel characteristics, while common parameters are determined jointly across all TRPs to reduce overall system complexity. This local quality approach optimizes each parameter set according to its specific needs.
3Adaptability or versatility
If CSI-RS resources are configured for multiple TRPs with different antenna ports, then adaptability to diverse TRP configurations is improved, but reporting overhead increases
Solution Approach 1:
The patent defines a universal CSI-RS resource configuration that can serve multiple TRPs with different antenna port configurations through a single resource setup. This universal configuration allows the system to maintain high adaptability to diverse TRP deployments while avoiding the need to configure and report separate CSI-RS resources for each TRP, thereby reducing reporting overhead.
Solution Approach 2:
The patent merges the configuration of multiple TRP-specific CSI-RS resources into a single shared CSI-RS resource that can be used across all TRPs. By combining the configuration information and using a unified approach to parameter determination, the system achieves the adaptability needed for diverse TRP configurations without the reporting overhead that would result from treating each TRP separately.
4Productivity
If Type II codebook support is extended to multi-TRP scenarios, then throughput performance is improved, but measurement and reporting complexity increases
Solution Approach 1:
The patent segments the Type II codebook extension to multi-TRP scenarios by separating port group-specific precoding parameters from common parameters. This segmentation enables the system to achieve improved throughput performance through accurate channel estimation for each TRP while managing measurement and reporting complexity by identifying and reusing common parameters across TRPs, thereby reducing redundant computations and reporting overhead.
Data Source
AI summary
A terminal device includes means for: receiving, from a network device, a port group configuration indicating at least two groups of antenna ports in a channel state information reference signal, CSI-RS, resource set including one or more CSI-RS resources, the at least two CSI-RS port groups being associated with at least two respective transmission reception points, TRPs, using coherent joint transmission, CJT, for downlink, DL, communication; receiving the one or more CSI-RS resources from the at least two TRPs having antenna ports belonging to the at least two respective CSI-RS port groups; determining, based on the one or more received CSI-RS resources, precoding parameters for DL precoding by the at least two respective TRPs, wherein said determining includes a separate determination of at least two port group-specific sets of precoding parameters specific to the at least two respective CSI-RS port groups.