PDSCH Transmission via TCI Code Point Mapping
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling explosively increasing data traffic, requiring advanced technologies to support higher per-user transmission rates, numerous connecting devices, low end-to-end latency, and high-energy efficiency, particularly in configuring schemes for multiple transmission reception points (TRPs) in next-generation mobile communication systems.
Innovation Solution
The method involves configuring cooperative transmission schemes among multiple TRPs for enhanced mobile broadband (eMBB) and ultra-reliable low-latency communication (URLLC) operations, including specific configurations for transport block transmission occasions and resource allocation in the time domain, as well as defining fields in the Downlink Control Information (DCI) to optimize data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple TRPs perform cooperative transmission to handle increasing data traffic and improve transmission rates, then the per-user transmission rate and data handling capability are improved, but the device complexity and system configuration complexity increase
Solution Approach 1:
The system segments the cooperative transmission configuration into distinct operational modes (eMBB and URLLC) with different parameter sets. Each mode has its own transport block transmission occasion configurations, allowing the system to handle multiple TRP cooperation scenarios without requiring a single complex configuration to cover all cases, thus improving transmission rate while managing complexity through modular segmentation.
Solution Approach 2:
The system dynamically selects between different transmission schemes and configurations based on the operational mode (eMBB or URLLC). The network can flexibly adjust the number of transport block transmission occasions, time domain resources, and DCI field configurations according to the specific service requirements, enabling the system to adapt to varying data traffic demands while maintaining manageable complexity through dynamic rather than static configuration.
2Reliability
If multiple TRPs are configured for cooperative transmission to support low latency and high reliability, then the transmission reliability and latency performance are improved, but the ease of operation and configuration simplicity deteriorate
Solution Approach 1:
The system applies different configuration parameters locally to different operational modes. URLLC operations receive configurations optimized for reliability and low latency (such as specific transport block transmission occasion settings), while eMBB operations receive configurations optimized for their respective requirements. This localized optimization allows each mode to achieve its performance targets without requiring the entire system to be configured for the most demanding scenario, thus improving reliability while maintaining operational ease through mode-specific configurations.
Solution Approach 2:
The system changes key parameters such as the number of transport block transmission occasions, time domain resource allocations, and DCI field configurations based on the operational mode. For URLLC, parameters are adjusted to ensure high reliability and low latency (e.g., specific repetition counts, dedicated time resources), while eMBB uses different parameter sets. These parameter changes enable the system to achieve mode-specific performance requirements without requiring complex manual configuration for each scenario, as the parameters can be dynamically adjusted based on the selected operational mode.
3Reliability
If transmission occasions are repeatedly transmitted to improve reliability for URLLC, then the transmission reliability is improved, but the use of energy and resource consumption increase
Solution Approach 1:
The system applies partial repetition of transmission occasions based on the specific URLLC requirements. Rather than always using maximum repetition counts, the network configures an appropriate number of transmission occasions (e.g., 2, 4, or more) based on the reliability requirements and channel conditions. This partial action approach achieves the necessary reliability improvement for URLLC while avoiding excessive energy consumption that would result from always using the maximum number of repetitions, thus balancing reliability enhancement with energy efficiency.
Data Source
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AI summary
Disclosed in the present disclosure are a method for transmitting and receiving a physical downlink shared channel (PDSCH) in a wireless communication system, and a device therefor. Particularly, a method by which user equipment (UE) receives a PDSCH in a wireless communication system comprises the steps of: receiving configuration information for the PDSCH, the configuration information including a plurality of TCI state configurations; receiving activation information, the plurality of TCI state configurations being activated by the activation information, and the activation information including mapping information about the activated TCI state configurations and code points of a transmission configuration indication (TCI) field in downlink control information; receiving the DCI including the TCI field; and receiving a plurality of PDSCH transmission occasions on the basis of the indication, through the TCI field, of a specific code point mapped to a plurality of TCI states, wherein the plurality of PDSCH transmission occasions correspond to the same transport block, the plurality of PDSCH transmission occasions are received in a time area resource on the basis of time division multiplexing (TDM), and the number of the plurality of PDSCH transmission occasions can be determined on the basis of the number of TCI states mapped to the specific code point.