DMRS Port Allocation Table for Flexible TCI State Mapping
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Solution Overview
Problem
Current non-coherent joint transmission (NC-JT) technologies face challenges in flexibly indicating the correspondence between code division multiplexing (CDM) groups and transmission configuration indication (TCI) states, particularly when the TCI field corresponds to two TCI states, limiting the flexibility of data transmission in coordinated multi-point (CoMP) systems.
Innovation Solution
The method involves dynamically adjusting the mapping relationship between TCI states and CDM groups by using specific values in the port allocation table, allowing for flexible allocation of DMRS ports to support different ranks at transmitting and receiving points, enabling efficient data transmission in CoMP systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed mapping relationship between CDM groups and TCI states is used, then the system complexity is reduced, but the adaptability to different TRP rank requirements is limited
Solution Approach 1:
The patent implements dynamic mapping between CDM groups and TCI states by introducing a port allocation table that can be flexibly configured. The mapping relationship is no longer fixed but can be dynamically adjusted according to different TRP rank requirements, allowing the system to adapt to varying transmission scenarios while maintaining manageable complexity through standardized table structures.
Solution Approach 2:
The patent changes the mapping parameters between CDM groups and TCI states based on different transmission scenarios. By using a port allocation table with configurable values, the system can change the mapping parameters to match different TRP rank requirements, thereby improving adaptability without permanently increasing system complexity.
2Adaptability or versatility
If the port allocation table includes all possible mapping relationships, then the flexibility is improved, but the signaling overhead increases
Solution Approach 1:
The port allocation table is designed to serve multiple functions: it can indicate mapping relationships for different numbers of TCI states (1 or 2), support different CDM group configurations, and adapt to various TRP rank requirements. This multi-functionality allows the system to achieve high flexibility without requiring separate signaling for each scenario, thereby controlling signaling overhead.
Solution Approach 2:
The patent includes only the necessary mapping relationships in the port allocation table based on actual deployment needs. Rather than including all theoretically possible mappings, the table includes only those required for current NC-JT scenarios, achieving sufficient flexibility while minimizing signaling overhead. The table can be extended partially as needed without comprehensive expansion.
Data Source
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AI summary
Disclosed in the present application are a method for transmission configuration indication (TCI) of a DMRS port and a related apparatus, and a storage medium. In the method, a network side device configures at least two DMRS ports for a terminal according to the correspondence between required TCI states and DMRS CDM groups, the at least two DMRS ports belonging to different CDM groups, and the different CDM groups comprising different numbers of DMRS ports; and sends DCI to the terminal, the DCI comprising a DMRS port index value, the DMRS port index value being an index value pre-defined in a DMRS port allocation table, and the DMRS port index value being used for indicating a DMRS port set allocated to the terminal, the number of CDM groups without data, and the number of preamble DMRS symbols, and being used for indicating the correspondence.