PUSCH Precoding for Partial-Coherent 8-Port UE Transmission
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Solution Overview
Problem
Existing technologies face challenges in efficiently managing PUSCH transmission for partial coherent UE with 8 antenna ports, particularly in determining optimal precoding matrices and antenna group configurations for coherent and non-coherent antenna port usage.
Innovation Solution
A method and apparatus for PUSCH transmission in partial coherent UE with 8 antenna ports, involving the use of DCI to schedule PUSCH with DMRS ports and TPMI fields to determine precoding matrices, and specifying antenna groups for coherent and non-coherent antenna port configurations based on reported UE capabilities and rank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 8 antenna ports are used for PUSCH transmission, then the data transmission capacity and spectral efficiency are improved, but the complexity of precoding matrix determination and antenna group configuration increases
Solution Approach 1:
The 8 antenna ports are divided into multiple antenna groups (e.g., 2 groups of 4 ports each, or 4 groups of 2 ports each). Each antenna group can be independently configured with coherent or non-coherent transmission, allowing the system to manage complexity by handling smaller subsets of antennas separately while achieving high overall capacity
Solution Approach 2:
The system supports partial coherent transmission where only subsets of antenna ports are configured as coherent groups, rather than requiring all 8 ports to be fully coherent. This allows flexible configuration (e.g., 2 coherent groups of 4 ports, or 4 coherent groups of 2 ports) that balances capacity requirements with implementation complexity
2Adaptability or versatility
If multiple antenna groups are configured for partial coherent transmission, then the flexibility in precoding matrix selection is improved, but the signaling overhead and configuration complexity increase
Solution Approach 1:
Different antenna groups are assigned different coherence properties and precoding configurations based on local channel conditions. Each antenna group can have its own coherent/non-coherent designation and precoding matrix selection, allowing tailored optimization for different spatial regions without requiring uniform configuration across all 8 antennas
Solution Approach 2:
The system dynamically selects which antenna groups to activate and how to configure their coherence based on current channel conditions, traffic requirements, and interference patterns. The gNB can adaptively adjust the number and composition of coherent antenna groups, switching between different configurations (e.g., 2 groups of 4, or 4 groups of 2) to optimize performance
3Power
If full coherent transmission is used across all 8 antenna ports, then the beamforming gain and spectral efficiency are improved, but the hardware synchronization requirements and implementation difficulty increase
Solution Approach 1:
Instead of requiring full coherent transmission across all 8 antenna ports, the system segments them into smaller coherent groups (e.g., 2 groups of 4 ports or 4 groups of 2 ports). Each group maintains internal coherence for beamforming gain, while the overall system achieves spatial diversity through multiple groups, reducing the hardware synchronization burden compared to full 8-port coherence
Solution Approach 2:
The system applies coherent transmission partially rather than fully - only within designated antenna groups rather than across all ports. This partial coherent approach maintains beamforming benefits within each group while avoiding the excessive hardware synchronization requirements of full coherent transmission across all 8 ports
Data Source
AI summary
Methods and apparatuses for PUSCH transmission for partial coherent UE with 8 antenna ports are disclosed. In one embodiment, a UE comprises a transceiver and a processor coupled to the transceiver, wherein the processor is configured to receive, via the transceiver, a DCI scheduling a PUSCH, wherein the DCI includes an antenna port(s) field indicating the number of DMRS ports that determines a rank of the scheduled PUSCH, and the DCI further includes a TPMI field indicating one or two precoding matrices; and determine the precoding matrix for the scheduled PUSCH according to the rank and the one or two precoding matrices.