CSI-RS Slot Offset for Multi-TRP Uplink Timing
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Solution Overview
Problem
Current CSI-RS transmission for non-codebook based PUSCH in multi-TRP scenarios is insufficient, particularly in terms of timing, as existing methods do not adequately account for beam switching and antenna panel switching times, leading to potential interference and reduced performance.
Innovation Solution
The proposed solution involves configuring multiple CSI-RS resources to be transmitted in different slots with a configurable slot offset relative to the DCI slot, allowing sufficient time for UE beam and antenna panel switching, and dynamically updating the slot offset through RRC, MAC-CE, or DCI to optimize timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple CSI-RS resources are transmitted in the same slot in multi-TRP scenarios, then resource utilization is improved, but beam switching and antenna panel switching cannot be completed properly causing interference and performance degradation
Solution Approach 1:
The patent segments the transmission timing by distributing multiple CSI-RS resources across different slots rather than transmitting them simultaneously in the same slot. This segmentation allows the UE sufficient time to complete beam switching and antenna panel switching between receiving different CSI-RS resources from different TRPs, thereby resolving the contradiction between resource utilization and beam switching reliability.
Solution Approach 2:
The patent introduces a slot offset parameter that is configured in advance to determine the timing relationship between DCI and CSI-RS resources. By pre-configuring the slot offset, the system ensures that sufficient time is allocated before CSI-RS transmission for the UE to prepare and complete beam/panel switching, thus maintaining reliability while enabling multi-TRP operation.
2Adaptability or versatility
If slot offset is dynamically updated through RRC, MAC-CE, or DCI, then timing optimization is improved, but signaling overhead and system complexity increase
Solution Approach 1:
The patent implements dynamic slot offset configuration that can be updated through multiple signaling mechanisms (RRC, MAC-CE, DCI). This dynamic capability allows the system to adapt timing parameters to changing channel conditions and traffic requirements, achieving optimal timing for CSI-RS transmission while managing complexity through hierarchical signaling options.
Solution Approach 2:
The patent changes the timing parameter (slot offset) to optimize CSI-RS transmission timing. By allowing the slot offset parameter to be configured and updated through different signaling methods, the system can adjust timing parameters to match varying operational requirements, balancing adaptability with controlled complexity through parameter management.
Data Source
AI summary
Systems, apparatuses, methods, and computer-readable media are provided to transmit multiple channel state information (CSI)-reference signal (RS) resources in different slots for non-Codebook based physical uplink shared channel (PUSCH) transmission in multi-transmission-reception point (TRP) operation. Other embodiments may be described and claimed.