DM-RS Configuration for DCI Payload Reduction in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving dedicated demodulation reference signals (DM-RSs), particularly in defining optimal Downlink Control Information (DCI) formats based on the number of symbols mapped, multiplexing methods, and channel state information, which affects payload size and overhead.
Innovation Solution
A method and apparatus that define DCI formats differently depending on the number of symbols to which DM-RSs are mapped, restrict multiplexing methods among antenna ports, and use a Rank Indicator to limit codebook subsets, thereby reducing payload size and overhead, and configure DM-RS for efficient reception of Physical Downlink Shared Channel (PDSCH) signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DCI format is defined with detailed DM-RS configuration parameters, then DM-RS transmission flexibility is improved, but payload size of DCI field increases
Solution Approach 1:
The DCI format is segmented into multiple fields with different configurations based on the number of DM-RS symbols (1 or 2 symbols). This segmentation allows the system to transmit only the necessary configuration parameters for the current scenario, reducing unnecessary payload while maintaining flexibility when needed.
Solution Approach 2:
The DCI format dynamically adapts its structure based on the DM-RS symbol count. When 1 symbol is used, a compact format is applied; when 2 symbols are used, an extended format with additional parameters is applied. This dynamic adaptation ensures payload size matches the actual configuration needs.
2Adaptability or versatility
If multiple multiplexing methods are supported among antenna ports, then system versatility is improved, but DCI overhead increases
Solution Approach 1:
Different multiplexing methods are applied to different antenna port groups based on local requirements. The patent restricts and configures multiplexing methods specifically for each antenna port group rather than applying a universal complex configuration, thereby reducing overall DCI overhead while maintaining necessary versatility.
3Measurement precision
If Rank Indicator defines more codebook subsets, then channel state information precision is improved, but payload size increases
Solution Approach 1:
The Rank Indicator defines codebook subsets selectively rather than exhaustively covering all possible subsets. The patent applies partial action by configuring only the necessary codebook subsets based on current channel conditions and requirements, achieving sufficient precision without the overhead of defining all possible subsets.
Data Source
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AI summary
Disclosed is a method and apparatus for transmitting and receiving a Reference Signal (RS) performed by a User Equipment (UE) in a wireless communication system. According to the present invention, a method and apparatus includes receiving a first Dedicated Demodulation Reference Signal and a first Physical Downlink Shared Channel (PDSCH); receiving a Physical Downlink Control Channel (PDCCH) including Downlink Control Information (DCI) in relation to a configuration of the second Dedicated Demodulation Reference Signal based on the first PDSCH; and receiving the second Dedicated Demodulation Reference Signal and a second PDSCH based on the PDCCH, and the first Dedicated Demodulation Reference Signal is transmitted only on a single antenna port, and a configuration of the DCI is determined based on the maximum number of symbols to which the second Dedicated Demodulation Reference Signal is mapped.