Downlink TDM Repetition Across Multi-TRP for Reliable URLLC
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Solution Overview
Problem
Current wireless communication systems face challenges in supporting explosive data traffic, high per-user data rates, a large number of connected devices, very low end-to-end latency, and high-energy efficiency, particularly in next-generation mobile communication systems.
Innovation Solution
The proposed method involves configuring a scheme for multiple transmission reception points (TRPs) to perform cooperative transmission, specifically using time division multiplexing (TDM) for URLLC M-TRP operation, where the number of transmission occasions for the same transport block is repeated, and resource allocation in the time domain is managed through Downlink Control Information (DCI) fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TRPs perform cooperative transmission using TDM, then data transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent segments the transmission process into multiple transmission occasions across different TRPs, where each TRP transmits portions of the transport block at different time instances. This segmentation allows the system to achieve diversity gain and improved reliability through multiple independent transmission paths while managing complexity by dividing the overall transmission task into manageable segments.
Solution Approach 2:
The patent employs periodic transmission occasions where the same transport block is repeatedly transmitted at predetermined time intervals across multiple TRPs. This periodic action enables the receiver to combine multiple transmissions for improved reliability while the predetermined periodic pattern simplifies resource management and reduces signaling overhead compared to adaptive scheduling.
2Reliability
If transmission occasions are repeated for the same transport block, then data transmission reliability is improved, but transmission latency increases
Solution Approach 1:
The patent configures transmission occasions with predetermined time patterns and resource allocations in advance through higher-layer signaling. This preliminary configuration allows the receiver to prepare for upcoming transmissions and perform early combining operations, reducing the effective processing latency while maintaining the reliability benefits of repeated transmissions.
Solution Approach 2:
The patent ensures continuous transmission of the same transport block across multiple TRPs without idle gaps by carefully designing overlapping or adjacent transmission occasions. This continuity maximizes the useful transmission time and enables the receiver to continuously process and combine incoming signals, improving reliability without significant latency penalty.
3Productivity
If dynamic resource allocation is performed through DCI fields, then spectral efficiency is improved, but processing complexity increases
Solution Approach 1:
The patent designs the DCI time domain resource assignment field to serve multiple functions: it indicates the resource allocation for the current transmission occasion, implicitly defines resources for subsequent transmission occasions through predefined patterns, and coordinates multiple TRPs simultaneously. This multi-functionality reduces the need for separate signaling fields, improving spectral efficiency while keeping processing complexity manageable through unified field interpretation.
Solution Approach 2:
The patent enables dynamic adjustment of transmission parameters including time domain resource allocation, frequency domain resources, modulation and coding scheme, and TRP selection through the DCI fields. These parameter changes allow adaptive optimization of spectral efficiency based on channel conditions while the standardized field structures and interpretation rules keep the processing complexity within acceptable limits for current hardware capabilities.
Data Source
AI summary
A method for transmitting and receiving downlink data in a wireless communication system, and a device for same are disclosed. Specifically, the method includes the steps of: receiving setting information; receiving downlink control information (DCI); and receiving a plurality of transmission occasions of the same transport block based on the DCI, wherein a repetition scheme based on time division multiplexing (TDM) is set based on the setting information, the DCI includes a time domain resource assignment field, resource allocation in a time domain for a first transmission occasion may be determined based on the time domain resource assignment field of the DCI, and the resource allocation in the time domain for a second transmission occasion may be determined based on the resource allocation in the time domain for the first transmission occasion.