Multi-TRP Uplink Signaling with Shared Rank Control
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Solution Overview
Problem
Existing wireless communication systems, particularly in new radio (NR), do not support efficient codebook-based uplink transmission for multiple transmission reception points (TRPs), leading to increased downlink control information (DCI) overhead and inefficiencies in uplink transmission.
Innovation Solution
A method and apparatus for transmitting an uplink signal to multiple TRPs using a user equipment (UE) with multiple antennas/panels, where downlink control indicators (DCIs) are utilized to determine transmission rank indicators and transmit precoder matrix indicators for each TRP, reducing DCI overhead and optimizing uplink resource allocation based on radio channel state and UE capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If codebook-based uplink transmission is supported for multiple TRPs, then uplink transmission reliability and capacity are improved, but DCI overhead and signaling payload increase
Solution Approach 1:
The patent segments the DCI structure by introducing separate fields for multiple TRPs: a first DCI field for first TRP indication information and a second DCI field for second TRP indication information. This segmentation allows independent control and optimization of signaling for each TRP, reducing overall overhead while maintaining multi-TRP transmission capability
Solution Approach 2:
The patent introduces a new dimension of TRP identification by adding TRP indication fields to the DCI structure. This dimensional expansion enables the system to distinguish and address multiple TRPs separately, allowing efficient resource allocation and reduced overhead through targeted signaling rather than blanket multi-TRP commands
2Adaptability or versatility
If signaling payload is increased to support multiple TRPs, then uplink transmission capability is improved, but system efficiency deteriorates
Solution Approach 1:
The patent changes key parameters of the DCI structure by introducing new fields (first TRP indication field, second TRP indication field) and modifying existing fields (SRI field, TPMI field, rank indication field) to support multi-TRP operations. These parameter changes enable adaptable uplink transmission capability while optimizing signaling efficiency through targeted field design
3Productivity
If DCI overhead is reduced through optimized signaling, then system efficiency is improved, but transmission precision for multiple TRPs may deteriorate
Solution Approach 1:
The patent introduces TRP indication information as an intermediary element that mediates between the DCI and multiple TRPs. This intermediary carries precise identification information for each TRP, ensuring accurate TRP selection and resource allocation while maintaining optimized signaling overhead through efficient encoding
Data Source
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AI summary
The present invention relates to NR communication. A method for a user equipment provided with a plurality of panels or antennas to transmit an uplink signal to a plurality of transmission reception points (TRPs) comprises the steps of: receiving Downlink Control Indicators (DCI) including first to n-th field values; and transmitting identical uplink data to the plurality of TRPs by using the same number of antenna ports on the basis of the DCIs, wherein the first field value among the first to n-th field values may be determined on the basis of a Transmission Rank Indicator (TRI) and a Transmit Precoder Matrix Indicator (TPMI) corresponding to the selected first TRP among the plurality of TRPs, the second to n-th field values may be determined on the basis of second to n-th TPMIs respectively corresponding to the remaining second to n-th TRPs other than the selected first TRP, and the TRIs corresponding to the second to n-th field values may be determined on the basis of the TRI in the first field value.