PUSCH DMRS Port Allocation for Multi-TRP Throughput
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Solution Overview
Problem
In multi-transmission and/or reception point (M-TRP) scenarios, the use of identical DMRS ports for PUSCH transmission across different TRPs limits throughput and results in a low PUSCH transmission rate due to repetition of the same DMRS ports.
Innovation Solution
A method for determining DMRS ports based on first indication information, including quasi-co-location (QCL) relationship and power control parameters, to differentiate DMRS ports for each TRP, utilizing spatial relation information, transmission configuration, and other network parameters to optimize DMRS port selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If identical DMRS ports are used for PUSCH transmission across different TRPs, then the system maintains simplicity in DMRS port configuration, but the throughput and PUSCH transmission rate are limited due to repetition of the same DMRS ports
Solution Approach 1:
The patent segments the DMRS port allocation by TRP, where each TRP is assigned distinct DMRS ports based on its spatial relation information. This segmentation allows different TRPs to use different DMRS ports simultaneously, eliminating the repetition problem while maintaining independent configuration for each TRP, thus improving throughput without excessive system-wide complexity.
Solution Approach 2:
The patent applies local quality by making DMRS port configuration TRP-specific rather than uniform across all TRPs. Each TRP's DMRS ports are determined by its own spatial relation information, allowing optimized local configuration for each TRP's transmission characteristics, which improves overall system productivity while keeping each local configuration relatively simple.
2Productivity
If different DMRS ports are allocated for different TRPs, then the PUSCH transmission rate and throughput are improved, but the complexity of DMRS port determination and spatial relation information processing increases
Solution Approach 1:
The patent uses preliminary action by pre-configuring spatial relation information for each TRP before PUSCH transmission. The terminal determines DMRS ports based on this pre-established spatial relation information, which simplifies the real-time determination process. The spatial relation information is prepared in advance through RRC configuration or MAC-CE signaling, reducing the complexity of on-the-fly DMRS port selection.
Solution Approach 2:
The patent uses copying by reusing the spatial relation information structure and QCL relationship concepts from downlink configurations for uplink DMRS port determination. This copying of existing information structures allows the system to leverage already-configured spatial parameters without creating entirely new complex determination mechanisms, thus improving productivity while controlling complexity.
3Measurement precision
If spatial relation information is used to determine DMRS ports, then the accuracy of TRP-specific port allocation is improved, but the amount of indication information and processing overhead increase
Solution Approach 1:
The patent applies universality by making the spatial relation information serve multiple functions: it is used for both downlink reception beamforming and uplink DMRS port determination. This multi-functionality allows the system to achieve accurate TRP-specific port allocation without requiring separate dedicated indication information, thus improving precision while minimizing additional information overhead.
Solution Approach 2:
The patent uses parameter changes by deriving DMRS port indices from spatial relation information parameters such as QCL relationships and SRS resource indicators. Instead of directly signaling DMRS port numbers, the system changes the approach to using derived parameters from existing configurations, which reduces indication information volume while maintaining accurate TRP-specific allocation through the spatial relationship parameters.
Data Source
AI summary
Embodiments of the present invention provide a DMRS port determining method and apparatus, a device, and a storage medium. The method comprises: receiving first indication information sent by a network device, the first indication information being used for indicating quasi co-location (QCL) relationship information and/or power control parameters corresponding to a physical uplink shared channel (PUSCH); and according to the first indication information, determining DMRS port(s) corresponding to the PUSCH, wherein the DMRS port(s) correspond(s) to one or multiple pieces of space related information, and the DMRS ports corresponding to different space related information among the multiple pieces of space related information are different.