Multi-TRP Downlink Retransmission With Dynamic Layer Remapping
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Solution Overview
Problem
Existing downlink control signaling in multi-TRP/panel transmission systems lacks efficient mechanisms for non-coherent joint transmission, leading to limited diversity gain and suboptimal retransmission performance when data parts from different TRPs or panels fail.
Innovation Solution
Implement a method where a data block is divided into multiple parts, each mapped to different transmission configuration indication (TCI) states, allowing for dynamic layer set mapping changes during retransmission to improve diversity gain and retransmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a data block is divided into multiple parts and transmitted with different TCI states in multi-TRP/panel transmission, then diversity gain is improved and retransmission performance is enhanced, but control signaling complexity increases
Solution Approach 1:
The data block is divided into multiple parts (first data part and second data part), where each part is mapped to different sets of layers and transmitted with different TCI states. This segmentation enables diversity gain by transmitting parts over different channels, improving retransmission performance when some parts fail.
Solution Approach 2:
The layer mapping is made dynamic by changing the set of layers for at least one data part during retransmission. The network device receives feedback indicating transmission failure and performs retransmission with modified layer mapping, adapting to channel conditions to improve reliability.
2Reliability
If dynamic layer set mapping changes are implemented during retransmission, then diversity gain increases and transmission reliability improves, but system complexity increases
Solution Approach 1:
The system implements dynamic layer set mapping where the network device changes the set of layers for retransmitted data parts based on feedback. This dynamic adaptation allows the system to respond to channel conditions and improve transmission reliability while managing complexity through structured retransmission procedures.
Solution Approach 2:
The network device receives feedback from the terminal device indicating transmission failure and uses this feedback to determine the retransmission strategy. The feedback mechanism enables informed decisions about layer mapping changes, balancing reliability improvement with system complexity management.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and apparatuses for downlink retransmission for multi-TPR/panel transmission. In an embodiment of the present disclosure, a feedback for a downlink transmission is received from a terminal device, wherein in the downlink transmission, a data block is divided into at least a first data part and a second data part, the first data part is mapped to a first set of layers and a second data part is mapped to a second set of layers, and the first data part and the second data part are transmitted with different transmission configuration indication (TCI) states. A downlink retransmission of at least one of the first data part and the second data part is performed, in response to the feedback indicating a transmission failure, with the at least one of the first data part and the second data part being mapped to a different set of layers from one used in the downlink transmission. With embodiments of the present disclosure, it is possible to obtain more diversity gain, thereby achieving better retransmission performance for the multi-TPR/panel transmission.