PMI-Based Precoding for Coherent Joint Transmission Channels
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Solution Overview
Problem
Wireless communications systems face challenges in improving signal transmission reliability and efficiency, particularly in complex and dynamic environments, including signal attenuation and blockage, which affect data throughput, coverage area, and device connectivity.
Innovation Solution
Implementing a unified transmission control indicator (TCI) state framework for coherent joint transmission (CJT) that enables separate or joint downlink and uplink TCI states for multiple channels, allowing UEs to determine precoders for optimal signal reception and transmission, and using precoding matrix indicators (PMIs) to enhance channel state indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate or joint downlink and uplink TCI states are implemented for multiple channels, then data throughput and reliability are improved, but device complexity increases
Solution Approach 1:
The patent segments the TCI state framework into separate downlink and uplink TCI states, allowing independent configuration and management of transmission parameters for different directions. This segmentation enables optimized signal transmission for each direction while maintaining overall system coordination, resolving the contradiction between improved throughput and increased complexity through structured organization.
Solution Approach 2:
The unified TCI state framework provides multi-functionality by supporting both separate and joint configuration modes for downlink and uplink transmissions. The framework can adaptively apply different TCI states across multiple channels (PDSCH, PUSCH, PDCCH, PUCCH) based on channel conditions and requirements, achieving improved reliability and throughput without requiring completely separate systems for each function.
2Reliability
If precoding matrix indicators (PMIs) are used to enhance channel state indication, then signal transmission reliability is improved, but control channel resources are consumed
Solution Approach 1:
The patent employs PMIs to dynamically indicate precoding matrix selections based on channel state conditions. By changing the precoding parameters according to PMI feedback, the system adapts to varying channel conditions to improve transmission reliability. The PMI mechanism efficiently conveys this information using compact indexing rather than full matrix transmission, managing control resource consumption.
Solution Approach 2:
PMIs act as an intermediary between the channel state information and the actual precoding application. Rather than directly transmitting full channel matrices or precoding details, the PMI provides a compressed indicator that enables the receiver to determine appropriate precoding settings, efficiently bridging the information gap while conserving control channel resources.
3Adaptability or versatility
If unified TCI state framework is implemented for multiple channels, then the ability of devices to intercommunicate is improved, but control signaling overhead increases
Solution Approach 1:
The patent merges the TCI state management across multiple channels (PDSCH, PUSCH, PDCCH, PUCCH) into a unified framework. This consolidation allows consistent transmission parameter application across different channel types while enabling coordinated adaptation to channel conditions. The unified approach improves device intercommunication capability by providing coherent parameter management, and the patent addresses overhead concerns through efficient state indication mechanisms.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for transmitting precoding matrix indicators (PMIs) for rank indications (RIs) and receiving coherent joint transmission (CJT) channels based on the PMIs. A method that may be performed at a user equipment (UE) includes outputting, for transmission, a report comprising a precoding matrix indicator (PMI) for a rank indication (RI); and obtaining, based on the PMI, a coherent joint transmission (CJT) physical downlink shared channel (PDSCH) having a rank, M, less than or equal to the RI.