RS Port Grouping for Multi-TRP DCI Overhead Reduction
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Solution Overview
Problem
In multi-TRP PDSCH transmission scenarios, ensuring orthogonality of DMRS from multiple TRPs is challenging, leading to increased DCI overhead and unsuitable multiple PDCCH scheduling for different UEs.
Innovation Solution
Partitioning RS ports into distinct groups and transmitting only the configuration of a target RS port group to the terminal device, reducing DCI overhead and avoiding interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple PDCCHs are used to schedule multiple PDSCHs from separate TRPs, then the terminal device can receive data from multiple TRPs, but the DCI overhead increases and coordination complexity increases
Solution Approach 1:
The patent segments the RS ports into multiple groups (first RS port group and second RS port group), where each group is associated with a different TRP. This segmentation allows the terminal device to differentiate RS ports from different TRPs without requiring separate PDCCH scheduling for each TRP, thereby reducing DCI overhead while maintaining multi-TRP reception capability
Solution Approach 2:
The patent introduces a new dimension of RS port group indication in the DCI format, allowing the network device to indicate which RS port group (first or second) should be used for demodulation. This additional dimension enables multi-TRP operation without requiring multiple separate PDCCH schedules
2Adaptability or versatility
If multiple PDCCHs are used to schedule multiple PDSCHs from separate TRPs, then the terminal device can receive data from multiple TRPs, but the coordination complexity increases
Solution Approach 1:
By segmenting RS ports into distinct groups associated with different TRPs, the patent simplifies the coordination mechanism. The terminal device only needs to follow a single PDCCH schedule and use the RS port group indication to determine which TRP's RS to use for demodulation, reducing coordination complexity compared to managing multiple independent PDCCH-PDSCH pairs
Solution Approach 2:
The single PDCCH format is enhanced to serve multiple functions: it schedules the PDSCH and simultaneously indicates the RS port group (first or second) for demodulation. This multi-functionality reduces the need for separate coordination mechanisms for each TRP
3Device complexity
If RS ports from multiple TRPs are transmitted without port group differentiation, then transmission simplicity is maintained, but the terminal device cannot differentiate which RS ports are from which TRP
Solution Approach 1:
The patent applies local quality by associating specific RS port groups with specific TRPs. The first RS port group is associated with the first TRP and the second RS port group with the second TRP. This localized association allows the terminal device to differentiate TRP sources while maintaining overall transmission simplicity through a unified PDCCH scheduling mechanism
Data Source
AI summary
Embodiments of the present disclosure relate to methods and devices for data transmission. In example embodiments, a method implemented in a network device is provided. According to the method, a target RS port group is determined from a plurality of RS ports for transmitting a RS. The RS ports are associated with at least one network device. Then, a configuration of the target RS port group is transmitted to the terminal device.