DMRS Port Mapping for Single DCI Multi-TRP Decoding
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Solution Overview
Problem
Current 5G wireless communication systems face challenges in efficiently supporting multi-transmission reception point (TRP) transmissions, particularly in configuring and decoding data across multiple TRPs using a single downlink control information (DCI) signal.
Innovation Solution
The system configures a 5G Node B to determine transmission configuration indicators (TCI) for multiple TRPs and transmits a single DCI signal including these indicators, along with a demodulation reference signal (DMRS) port indication value, to enable a user equipment (UE) to decode data from multiple code division multiplexing (CDM) groups, allowing for multi-TRP transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a single DCI signal is used to control multiple TRP transmissions, then control signaling overhead is reduced, but the complexity of configuring and decoding data from multiple TRPs increases
Solution Approach 1:
The patent segments the multi-TRP data transmission into multiple CDM groups, where each group is associated with a specific TRP. The DMRS port indication value further segments the DMRS ports into groups corresponding to each CDM group. This segmentation allows the UE to separately process and decode data from different TRPs using the same DCI signal, reducing control overhead while managing decoding complexity through structured organization.
Solution Approach 2:
The single DCI signal serves multiple functions by controlling transmissions from multiple TRPs simultaneously. The DMRS port indication value in the DCI signal universally applies to multiple CDM groups, enabling the same control signal to coordinate diverse TRP transmissions. This multi-functionality reduces the need for separate DCI signals for each TRP, lowering control signaling overhead.
2Reliability
If multiple TCI states are configured for different TRPs, then transmission reliability is improved, but the complexity of managing TCI state mappings increases
Solution Approach 1:
The patent applies local quality by associating each CDM group with specific TCI states that are optimized for particular TRPs. Each CDM group receives tailored TCI state configurations appropriate for its corresponding TRP's transmission characteristics. This localized TCI state mapping improves transmission reliability for each TRP while organizing the complexity into manageable, TRP-specific segments rather than a monolithic configuration.
Solution Approach 2:
The CDM groups act as intermediaries between the multiple TCI states and the UE decoding process. Instead of directly managing complex mappings between multiple TCI states and multiple TRPs, the system introduces CDM groups as intermediary layers. Each CDM group mediates the relationship between specific TCI states and their corresponding TRP transmissions, simplifying the overall management of TCI state mappings.
3Measurement precision
If DMRS ports are correlated with TCI states for multi-TRP transmission, then data decoding accuracy is improved, but the complexity of DMRS port indication increases
Solution Approach 1:
The patent introduces an additional dimension of organization by correlating DMRS ports not only with TCI states but also with CDM groups. This creates a three-dimensional mapping structure: TCI states → CDM groups → DMRS ports. This dimensional expansion allows the system to maintain precise DMRS port indications for accurate data decoding while organizing the complexity into a structured hierarchy that is more manageable than direct one-to-one mappings between all parameters.
Data Source
AI summary
Some embodiments of this disclosure include systems, apparatuses, methods, and computer-readable media for a single downlink control information (DCI) signal that supports multi-transmission reception point (TRP) transmissions from different TRPs (e.g., different 5G Node Bs or different antenna panels.) A user equipment (UE) receives a single DCI signal that includes a first transmission configuration indicator (TCI) state of a first TRP, a second TCI state of a second TRP, and a demodulation reference signal (DMRS) port indication value. The UE uses the DMRS port indication value to determine a first DMRS port and a first code division multiplexing (CDM) group of the first TCI state and a second DMRS port and a second CDM group of the second TCI state. The UE receives a multi-Physical Downlink Shared Channel (PDSCH) signal that includes multi-TRP transmissions, and uses the above determinations to decode data from the first and/or the second TCI states.