Multi-TRP PDCCH Transmission for Reliable DCI Reception
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Solution Overview
Problem
In a 5G New Radio (NR) system, especially when operating in frequency range 2, high frequency channel fading poses challenges for reliable and efficient Physical Downlink Control Channel (PDCCH) transmission due to the use of multiple Transmission Reception Points (TRPs), necessitating improved methods for decoding Downlink Control Information (DCI) signaling.
Innovation Solution
A method and apparatus for determining the number of PDCCH transmission occasions and DCI signaling receiving modes based on the number of transmission resources, enabling correct reception of DCI signaling through repeated or partial content transmission across multiple TRPs, utilizing modules for obtaining, determining, and receiving DCI signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TRPs are used to transmit DCI signaling to improve transmission reliability, then transmission reliability is improved, but the complexity of determining the correct reception mode increases
Solution Approach 1:
The patent segments the DCI signaling transmission into multiple transmission occasions across different TRPs. Each TRP transmits DCI signaling in a separate transmission occasion, allowing the terminal to receive and decode signaling from multiple sources. This segmentation improves reliability through diversity while managing complexity by providing clear indication information for each segment.
Solution Approach 2:
The patent introduces indication information as an intermediary element that carries the number of transmission resources to the terminal. This intermediary provides the terminal with the necessary knowledge to determine the correct reception mode without requiring complex autonomous decision-making, thus improving reliability while controlling complexity.
2Productivity
If the same DCI signaling is transmitted by multiple TRPs to improve transmission efficiency, then transmission efficiency is improved, but the difficulty of determining transmission parameters increases
Solution Approach 1:
The patent applies preliminary action by providing indication information in advance that specifies the number of transmission resources. This allows the terminal to pre-determine the reception mode before actual DCI signaling reception, eliminating the need for complex real-time analysis of transmission parameters and simplifying the detection process while maintaining high transmission efficiency.
Solution Approach 2:
The indication information acts as a feedback mechanism from the network side to the terminal, providing explicit guidance on transmission parameters. This feedback eliminates ambiguity in parameter detection by directly informing the terminal of the number of transmission resources, thereby reducing detection difficulty while enabling efficient multi-TRP operation.
3Device complexity
If DCI signaling reception is performed without explicit transmission occasion indication, then device complexity is reduced, but transmission reliability deteriorates due to channel fading
Solution Approach 1:
The patent changes the parameter of transmission indication by introducing explicit indication information about the number of transmission occasions. This parameter change enables the terminal to adapt its reception strategy to the actual transmission scenario, improving reliability in fading channels while keeping the reception mechanism relatively simple through standardized processing of the indication parameter.
Data Source
AI summary
A transmission method is performed by a terminal, and includes: obtaining a number of Physical Downlink Control Channel (PDCCH) transmission occasions; determining, based on the number of PDCCH transmission occasions and a number of transmission resources, a Downlink Control Information (DCI) signaling receiving mode; and receiving a DCI signaling based on the DCI signaling receiving mode.