Multi-TRP Transmission With Unified TCI and DMRS Port Mapping
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Solution Overview
Problem
Existing 3GPP specifications do not adequately address multi-TRP transmission, leading to increased overhead in indicating DMRS ports and TCI states for multiple TRPs, which is inefficient and resource-intensive.
Innovation Solution
Implement a method to configure a single TCI state indicating multiple RS sets associated with multiple TRPs, with DMRS ports and their associations implicitly indicated through DCI or MAC layer signaling, reducing the overhead in multi-TRP transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate TCI states and DMRS ports are configured for each TRP, then multi-TRP transmission capability is achieved, but signaling overhead increases significantly
Solution Approach 1:
The patent merges multiple TCI states into a single unified TCI state that can indicate multiple RS sets corresponding to multiple TRPs. Instead of configuring separate TCI states for each TRP, the invention creates a consolidated TCI state structure that efficiently manages references to multiple transmission points, thereby reducing signaling overhead while maintaining multi-TRP transmission capability.
Solution Approach 2:
The unified TCI state is designed to serve multiple functions simultaneously - it can indicate RS sets for multiple TRPs, support both single-TRP and multi-TRP transmission modes, and provide a universal framework that works across different transmission scenarios. This multi-functional design eliminates the need for separate configuration mechanisms for different TRP scenarios.
2Measurement precision
If explicit indication of DMRS ports for each TRP is implemented, then accurate channel estimation is enabled, but resource efficiency decreases due to increased overhead
Solution Approach 1:
The patent enables the terminal to self-determine DMRS port associations with TRPs by using the unified TCI state information. Instead of requiring explicit network signaling for each DMRS port assignment, the terminal autonomously maps DMRS ports to corresponding TRPs based on the RS set indications in the unified TCI state, thereby reducing overhead while maintaining accurate channel estimation.
3Adaptability or versatility
If multiple separate TCI states are configured for multiple TRPs, then transmission flexibility is improved, but configuration complexity increases
Solution Approach 1:
The unified TCI state is segmented into multiple RS set indications, where each RS set corresponds to a specific TRP. This segmentation allows the system to maintain transmission flexibility by individually configuring RS sets for different TRPs while presenting a unified, simpler interface to the terminal, thereby reducing configuration complexity without sacrificing adaptability.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for multi-TRP transmission. The method comprises determining at least one transmission configuration indication (TCI) state to be configured to a terminal device, the at least one TCI state indicating a plurality of reference signal (RS) sets and quasi co-location relationship between the plurality of RS sets and respective groups of DMRS ports. The method further comprises determining DMRS ports for transmitting DMRSs to the terminal device via the plurality of TRPs and associations between the plurality of RS sets and the DMRS ports. In addition, the method further comprises configuring the at least one TCI state, the DMRS ports, and the associations between the plurality of RS sets and the DMRS ports to the terminal device. In this way, multi-TRP transmission can be supported without introducing additional indication overhead.