PDSCH TRP Repetition Indication for Data Consistency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In current New Radio (NR) systems, terminal devices cannot determine whether enhanced mobile broadband (eMBB) or ultra-reliable low-latency communication (URLLC) data is being transmitted, leading to data transmission errors due to uncertainty about the use of TCI states and data consistency across transport layers.
Innovation Solution
A method where a network device determines and communicates first information to a terminal device regarding the repetition transmission of Physical Downlink Shared Channel (PDSCH) using multiple Transmission/Reception Points (TRPs, allowing the terminal device to determine whether different DMRS port groups correspond to the same data or distinct TCI states, thereby ensuring accurate data reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TCI states are configured for downlink PDSCH transmission through DCI, then transmission reliability is improved through diversity transmission, but terminal device cannot determine whether same or different data is transmitted on different transport layers, resulting in data transmission errors
Solution Approach 1:
The network device sends indication information to the terminal device to explicitly feedback whether different transport layers carry same or different data. This feedback mechanism allows the terminal device to correctly interpret the multiple TCI states configured by the network device, resolving the ambiguity that caused data transmission errors while maintaining diversity transmission for reliability.
Solution Approach 2:
The indication information acts as an intermediary between the network device and terminal device. It mediates the communication by providing the terminal device with the necessary information to correctly understand how to process multiple TCI states, thereby preventing data transmission errors without compromising transmission reliability.
2Productivity
If multiple TRPs are used for PDSCH transmission, then spectrum efficiency is improved for eMBB data, but transmission reliability deteriorates for URLLC data due to lack of diversity transmission
Solution Approach 1:
The system dynamically adapts the transmission mode based on the data type. For eMBB data, multiple TRPs transmit different data to maximize spectrum efficiency. For URLLC data, multiple TRPs transmit same data through diversity transmission to maximize reliability. The indication information enables the terminal device to dynamically adjust its reception strategy according to the current transmission mode.
Solution Approach 2:
The transmission parameters (data content on different transport layers) are changed based on the service type. The indication information carries the parameter that tells the terminal device whether to expect same or different data, allowing the system to switch between spectrum efficiency optimization and reliability optimization modes.
3Loss of energy
If the terminal device autonomously determines TCI state usage without explicit indication, then signaling overhead is reduced, but data transmission errors increase due to uncertainty
Solution Approach 1:
Instead of providing complete detailed instructions for all possible scenarios, the system provides partial indication information that gives the terminal device just enough information to correctly interpret the TCI states. This minimal necessary information reduces signaling overhead compared to full configuration while still preventing data transmission errors.
Data Source
AI summary
A data transmission method, an apparatus, a device, and a storage medium is provided. A network device (110) determines first information according to whether currently transmitted PDSCH is repeatedly transmitted by using a plurality of TRPs, and indicates the first information to a terminal device (120). The terminal device (120) determines whether different DMRS port groups of the PDSCH correspond to same data, or determines a TCI state corresponding to each DMRS port of the PDSCH according to the first information indicated by the network device (110), and then detects data according to whether data corresponding to the ports are the same or the TCI state, ensuring that data can be received correctly.