Eight-Layer Uplink Precoding With Reduced DCI Signaling
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Solution Overview
Problem
Existing wireless communication standards, such as 3GPP, are limited to up to four layers for physical uplink shared channel (PUSCH) transmissions, leading to inefficiencies and increased DCI overhead when extending to eight layers, which is not adequately addressed.
Innovation Solution
Enhanced methods for signaling transmit precoding matrix indicators (TPMIs) support up to eight layers with reduced DCI overhead, including joint or separate encoding of rank and precoder indicators, codebook subsets, and dynamic switching between single and multiple codewords.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing wireless communication standards (3GPP) are used for uplink transmissions, then the system is simple and well-defined, but the number of layers is limited to four, reducing transmission efficiency and capacity
Solution Approach 1:
The patent changes the parameter of transmission layers from the conventional limit of four to eight layers by modifying the precoding matrix indicator (TPMI) signaling mechanism. This allows the system to support higher layer configurations while maintaining compatibility with existing frameworks through enhanced signaling methods.
Solution Approach 2:
The patent segments the precoding configuration into multiple codebook subsets, each corresponding to different coherence types (fully coherent, partially coherent, non-coherent). This segmentation enables flexible selection of appropriate codebook subsets for eight-layer transmissions, resolving the complexity issue by organizing the solution into manageable parts.
2Productivity
If the number of layers is extended from four to eight, then transmission capacity and efficiency are improved, but DCI overhead increases
Solution Approach 1:
The patent applies partial action by indicating only the necessary codebook subset information in DCI for eight-layer transmissions, rather than transmitting complete precoding matrices. This reduces DCI overhead while still enabling the system to achieve eight-layer transmission capacity through the pre-defined codebook subsets.
Solution Approach 2:
The patent performs preliminary action by pre-defining multiple codebook subsets with different coherence types before transmission. This allows the system to select and indicate only the relevant subset index in DCI, rather than transmitting detailed precoding information, thereby reducing overhead while maintaining eight-layer capacity.
3Adaptability or versatility
If codebook subsets are introduced for different coherence types, then precoder configuration flexibility is improved, but signaling complexity increases
Solution Approach 1:
The patent merges the indications of coherence type and precoder selection into a unified codebook subset framework. By combining these functions into subset indices (e.g., first subset for fully coherent, second subset for partially coherent, third subset for non-coherent), the system achieves flexible precoder configuration while reducing signaling complexity compared to separate indications.
Data Source
AI summary
This disclosure describes systems, methods, and devices for configuring an uplink transmission for a user equipment device (UE) using eight transmitters. A network device may encode a precoder rank indicator for use in an eight-transmitter uplink transmission by a UE device; encode a precoder indicator, indicative of a precoder type, for use in the eight-transmitter uplink transmission by the UE device; and encode downlink control information (DCI) for transmission to the UE device, the DCI including the precoder rank and the precoder indicator.