Multi-TRP PDSCH Scheduling Using Joint DM-RS Port Indication
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Solution Overview
Problem
Existing technologies face challenges in dynamically indicating the transmission scheme for Physical Downlink Shared Channel (PDSCH) transmissions from multiple Transmission/Reception Points (TRPs) in wireless communications networks.
Innovation Solution
A method is proposed to use an antenna port field in Downlink Control Information (DCI) to jointly indicate both the Demodulation Reference Signal (DM-RS) ports and the transmission scheme for PDSCH, allowing flexible scheduling without additional DCI overhead, by linking DM-RS port allocation to the indicated Transmission Configuration Indicator (TCI) states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If separate fields are used to indicate TCI states and DM-RS ports in DCI, then complete transmission configuration can be provided, but DCI overhead increases
Solution Approach 1:
The patent combines the indication of TCI states and DM-RS ports into a single joint indication field in DCI. The antenna port field is used to simultaneously indicate both the TCI state and the DM-RS port, eliminating the need for separate fields and thereby reducing DCI overhead while maintaining complete transmission configuration information.
Solution Approach 2:
The antenna port field serves multiple functions: it indicates both the TCI state and the DM-RS port simultaneously. This multi-functional usage of a single field reduces the overall DCI size while ensuring that all necessary transmission configuration information is conveyed to the UE.
2Adaptability or versatility
If multiple TCI states are indicated in DCI, then multi-TRP PDSCH transmission can be enabled, but interpretation complexity increases
Solution Approach 1:
The patent pre-configures multiple DM-RS port tables in the UE before actual PDSCH reception. Each table corresponds to a specific interpretation rule for the antenna port field when different numbers of TCI states are indicated. This preliminary configuration allows the UE to quickly select the appropriate table based on the TCI field value without complex real-time interpretation.
Solution Approach 2:
The system dynamically selects which DM-RS port table to use based on the number of TCI states indicated in the DCI. When one TCI state is indicated, a first table is used; when multiple TCI states are indicated, a second table is used. This dynamic adaptation simplifies the UE's processing by providing clear, pre-defined behavior for different scenarios.
3Adaptability or versatility
If additional DCI fields are added to indicate transmission scheme, then scheduling flexibility improves, but control signal overhead increases
Solution Approach 1:
The transmission scheme indication is merged into the existing antenna port field interpretation. By using different DM-RS port tables based on the number of indicated TCI states, the patent achieves transmission scheme indication without adding new DCI fields, thus maintaining scheduling flexibility while avoiding additional control overhead.
Data Source
AI summary
Dynamic indication of multi-Transmission/Reception Point (TRP) Physical Downlink Shared Channel (PDSCH) transmission is provided. A solution is proposed to use an antenna port field (e.g., a Demodulation Reference Signal (DM-RS) port indication field) in Downlink Control Information (DCI) to jointly indicate both the DM-RS ports and the scheme used for a PDSCH transmission. When more than one Transmission Configuration Indicator (TCI) state is indicated in a DCI, a new DM-RS table is used in which a DM-RS port allocation is also linked to a transmission scheme. The solution enables flexible PDSCH scheduling without introducing additional DCI overhead.