Single-DCI Precoding Indication for Single- and Multi-TRP Switching
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Solution Overview
Problem
Existing 5G/NR systems lack effective methods for switching between single-TRP and multi-TRP transmission, which is crucial for enhancing reliability and throughput in multi-point cooperative transmission.
Innovation Solution
A precoding indication method using a single DCI to indicate beam information and transmission configuration, allowing for switching between single-panel/single-TRP and multi-panel/multi-TRP transmissions by including multiple sets of information indication fields for SRI or TPMI, enabling codebook-based and non-codebook-based PUSCH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single DCI is used to schedule multi-panel/multi-TRP transmission, then scheduling efficiency is improved, but the complexity of indicating transmission configuration increases
Solution Approach 1:
The transmission configuration information is segmented into multiple sets of information indication fields, where each set corresponds to a specific TRP. This allows the single DCI to efficiently schedule multi-TRP transmission by including multiple independent field sets, each with its own SRI/TPMI indication, thereby maintaining scheduling efficiency while managing configuration complexity through structured organization.
Solution Approach 2:
The single DCI structure is designed to be universal, capable of indicating both single-TRP and multi-TRP transmission configurations through the same control information. By making the DCI format flexible and adaptable, the system avoids the need for separate control mechanisms, thus improving scheduling efficiency without proportionally increasing complexity.
2Adaptability or versatility
If multiple sets of information indication fields are included in the DCI, then multi-TRP transmission capability is improved, but the size of DCI increases
Solution Approach 1:
The DCI structure is made dynamic, allowing the number and configuration of information indication fields to be adjusted based on the specific transmission scenario. When single-TRP transmission is scheduled, only one set of fields is included; when multi-TRP transmission is scheduled, multiple sets are included. This dynamic adaptation ensures that the DCI size grows only when necessary, maintaining efficiency while providing versatile multi-TRP capability.
Data Source
AI summary
A precoding indication method is provided. The method includes: sending a single downlink control information (DCI) to a user equipment (UE), in which the single DCI includes transmission configuration indicator (TCI) beam indication information and transmission configuration information, the TCI beam indication information is configured to indicate beam information used by the UE for transmission, in a case where the TCI beam indication information indicates one beam, the transmission configuration information includes a set of information indication fields for a single-panel and single-transmission and reception point (TRP) transmission, and in a case where the TCI beam indication information indicates two or more beams, the transmission configuration information includes two or more sets of information indication fields for a multiple panels (multi-panel) and multiple TRPs (multi-TRP) transmission; each set of information indication fields includes at least one of a sounding reference signal (SRS) resource indicator (SRI) indication field or a transmit precoding matrix indicator (TPMI) indication field.