PTRS-DMRS Association Signaling for Multi-TRP PUSCH Occasions
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Solution Overview
Problem
Current DCI signaling in wireless communication systems is unable to efficiently indicate the association between phase tracking reference signals (PTRS) and demodulation reference signals (DMRS) for multi-TRP PUSCH transmissions without increasing overhead.
Innovation Solution
A novel approach is introduced to provide PTRS-DMRS association information using existing DCI fields, such as the PTRS-DMRS association field, TPMI field, and SRI field, without adding additional bits, by associating PTRS ports with DMRS ports through SRS resource sets, spatial relations, and other parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PTRS-DMRS association information is indicated for multi-TRP PUSCH transmissions, then transmission accuracy is improved, but DCI overhead increases
Solution Approach 1:
The patent makes existing DCI fields (PTRS-DMRS association field, TPMI field, SRI field) serve multiple functions. These fields are reused to indicate PTRS-DMRS associations for multiple TRPs without adding new signaling elements, thereby achieving multi-TRP support while maintaining overhead efficiency
Solution Approach 2:
The patent changes the interpretation and mapping of existing DCI parameters to convey PTRS-DMRS association information for multiple TRPs. By reusing existing fields with different semantic meanings in different contexts, the system achieves enhanced functionality without increasing signaling overhead
2Reliability
If separate PTRS-DMRS associations are provided for multiple PUSCH transmission occasion groups, then transmission reliability is improved, but signaling complexity increases
Solution Approach 1:
The patent segments PUSCH transmission occasions into multiple groups, where each group can have its own PTRS-DMRS association configuration. This segmentation allows independent optimization of each transmission group while managing complexity through structured organization
Solution Approach 2:
The patent enables dynamic selection and configuration of PTRS-DMRS associations for different PUSCH transmission occasion groups. The system can adaptively assign different association configurations based on channel conditions, traffic requirements, and TRP configurations, achieving reliability improvement without permanent complexity increase
Data Source
AI summary
Presented are systems and methods for indicating phase tracking reference signal-demodulation reference signal (PTRS-DMRS) association. A wireless communication device may receive a scheduling grant to trigger a first group of physical uplink shared channel (PUSCH) transmission occasions and a second group of PUSCH transmission occasions from a wireless communication node. The scheduling information carried by the scheduling grant may at least include port association information of PTRS-DMRS. The port association information may comprise a first port association for the first group of PUSCH transmission occasions and a second port association for the second group of PUSCH transmission occasions. The second port association may be at least associated with a portion of the scheduling information which is at least for the first group of PUSCH transmission occasions.